diff --git a/api/units/all-features.txt b/api/units/all-features.txt
index 6217193eb..0024bfd51 100644
--- a/api/units/all-features.txt
+++ b/api/units/all-features.txt
@@ -145,6 +145,7 @@ impl core::cmp::PartialOrd for bitcoin_units::locktime::relative::Height
 impl core::cmp::PartialOrd for bitcoin_units::locktime::relative::Time
 impl core::cmp::PartialOrd for bitcoin_units::weight::Weight
 impl core::convert::AsRef<core::num::error::ParseIntError> for bitcoin_units::parse::ParseIntError
+impl core::convert::From<bitcoin_units::Amount> for bitcoin_units::SignedAmount
 impl core::convert::From<bitcoin_units::amount::InputTooLargeError> for bitcoin_units::amount::ParseAmountError
 impl core::convert::From<bitcoin_units::amount::InputTooLargeError> for bitcoin_units::amount::ParseError
 impl core::convert::From<bitcoin_units::amount::InvalidCharacterError> for bitcoin_units::amount::ParseAmountError
@@ -198,7 +199,6 @@ impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::locktime::
 impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::locktime::relative::Height
 impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::locktime::relative::Time
 impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::weight::Weight
-impl core::convert::TryFrom<bitcoin_units::Amount> for bitcoin_units::SignedAmount
 impl core::convert::TryFrom<bitcoin_units::SignedAmount> for bitcoin_units::Amount
 impl core::convert::TryFrom<bitcoin_units::block::BlockHeight> for bitcoin_units::locktime::absolute::Height
 impl core::convert::TryFrom<bitcoin_units::block::BlockInterval> for bitcoin_units::locktime::relative::Height
@@ -723,6 +723,7 @@ pub const fn bitcoin_units::SignedAmount::checked_rem(self, rhs: i64) -> core::o
 pub const fn bitcoin_units::SignedAmount::checked_sub(self, rhs: bitcoin_units::SignedAmount) -> core::option::Option<bitcoin_units::SignedAmount>
 pub const fn bitcoin_units::SignedAmount::from_int_btc_const(whole_bitcoin: i64) -> bitcoin_units::SignedAmount
 pub const fn bitcoin_units::SignedAmount::from_sat(satoshi: i64) -> bitcoin_units::SignedAmount
+pub const fn bitcoin_units::SignedAmount::from_sat_unchecked(satoshi: i64) -> bitcoin_units::SignedAmount
 pub const fn bitcoin_units::SignedAmount::to_sat(self) -> i64
 pub const fn bitcoin_units::block::BlockHeight::from_u32(inner: u32) -> Self
 pub const fn bitcoin_units::block::BlockHeight::to_u32(self) -> u32
@@ -830,7 +831,7 @@ pub fn bitcoin_units::Amount::sum<I: core::iter::traits::iterator::Iterator<Item
 pub fn bitcoin_units::Amount::sum<I>(iter: I) -> Self where I: core::iter::traits::iterator::Iterator<Item = &'a bitcoin_units::Amount>
 pub fn bitcoin_units::Amount::to_btc(self) -> f64
 pub fn bitcoin_units::Amount::to_float_in(self, denom: bitcoin_units::amount::Denomination) -> f64
-pub fn bitcoin_units::Amount::to_signed(self) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::OutOfRangeError>
+pub fn bitcoin_units::Amount::to_signed(self) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::Amount::to_string_in(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::Amount::to_string_with_denomination(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::Amount::try_from(value: bitcoin_units::SignedAmount) -> core::result::Result<Self, Self::Error>
@@ -855,6 +856,7 @@ pub fn bitcoin_units::SignedAmount::div(self, rhs: i64) -> Self::Output
 pub fn bitcoin_units::SignedAmount::div_assign(&mut self, rhs: i64)
 pub fn bitcoin_units::SignedAmount::eq(&self, other: &bitcoin_units::SignedAmount) -> bool
 pub fn bitcoin_units::SignedAmount::fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+pub fn bitcoin_units::SignedAmount::from(value: bitcoin_units::Amount) -> Self
 pub fn bitcoin_units::SignedAmount::from_btc(btc: f64) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::ParseAmountError>
 pub fn bitcoin_units::SignedAmount::from_float_in(value: f64, denom: bitcoin_units::amount::Denomination) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::ParseAmountError>
 pub fn bitcoin_units::SignedAmount::from_int_btc<T: core::convert::Into<i64>>(whole_bitcoin: T) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::OutOfRangeError>
@@ -889,7 +891,6 @@ pub fn bitcoin_units::SignedAmount::to_float_in(self, denom: bitcoin_units::amou
 pub fn bitcoin_units::SignedAmount::to_string_in(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::SignedAmount::to_string_with_denomination(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::SignedAmount::to_unsigned(self) -> core::result::Result<bitcoin_units::Amount, bitcoin_units::amount::OutOfRangeError>
-pub fn bitcoin_units::SignedAmount::try_from(value: bitcoin_units::Amount) -> core::result::Result<Self, Self::Error>
 pub fn bitcoin_units::SignedAmount::type_prefix(_: private::Token) -> &'static str
 pub fn bitcoin_units::SignedAmount::unchecked_add(self, rhs: bitcoin_units::SignedAmount) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::SignedAmount::unchecked_sub(self, rhs: bitcoin_units::SignedAmount) -> bitcoin_units::SignedAmount
@@ -1254,7 +1255,6 @@ pub type bitcoin_units::Amount::Error = bitcoin_units::amount::OutOfRangeError
 pub type bitcoin_units::Amount::Output = bitcoin_units::Amount
 pub type bitcoin_units::Amount::Output = bitcoin_units::fee_rate::FeeRate
 pub type bitcoin_units::SignedAmount::Err = bitcoin_units::amount::ParseError
-pub type bitcoin_units::SignedAmount::Error = bitcoin_units::amount::OutOfRangeError
 pub type bitcoin_units::SignedAmount::Output = bitcoin_units::SignedAmount
 pub type bitcoin_units::amount::Denomination::Err = bitcoin_units::amount::ParseDenominationError
 pub type bitcoin_units::block::BlockHeight::Err = bitcoin_units::parse::ParseIntError
diff --git a/api/units/alloc-only.txt b/api/units/alloc-only.txt
index 13e5cb270..79871eefc 100644
--- a/api/units/alloc-only.txt
+++ b/api/units/alloc-only.txt
@@ -141,6 +141,7 @@ impl core::cmp::PartialOrd for bitcoin_units::locktime::relative::Height
 impl core::cmp::PartialOrd for bitcoin_units::locktime::relative::Time
 impl core::cmp::PartialOrd for bitcoin_units::weight::Weight
 impl core::convert::AsRef<core::num::error::ParseIntError> for bitcoin_units::parse::ParseIntError
+impl core::convert::From<bitcoin_units::Amount> for bitcoin_units::SignedAmount
 impl core::convert::From<bitcoin_units::amount::InputTooLargeError> for bitcoin_units::amount::ParseAmountError
 impl core::convert::From<bitcoin_units::amount::InputTooLargeError> for bitcoin_units::amount::ParseError
 impl core::convert::From<bitcoin_units::amount::InvalidCharacterError> for bitcoin_units::amount::ParseAmountError
@@ -194,7 +195,6 @@ impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::locktime::
 impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::locktime::relative::Height
 impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::locktime::relative::Time
 impl core::convert::TryFrom<alloc::string::String> for bitcoin_units::weight::Weight
-impl core::convert::TryFrom<bitcoin_units::Amount> for bitcoin_units::SignedAmount
 impl core::convert::TryFrom<bitcoin_units::SignedAmount> for bitcoin_units::Amount
 impl core::convert::TryFrom<bitcoin_units::block::BlockHeight> for bitcoin_units::locktime::absolute::Height
 impl core::convert::TryFrom<bitcoin_units::block::BlockInterval> for bitcoin_units::locktime::relative::Height
@@ -674,6 +674,7 @@ pub const fn bitcoin_units::SignedAmount::checked_rem(self, rhs: i64) -> core::o
 pub const fn bitcoin_units::SignedAmount::checked_sub(self, rhs: bitcoin_units::SignedAmount) -> core::option::Option<bitcoin_units::SignedAmount>
 pub const fn bitcoin_units::SignedAmount::from_int_btc_const(whole_bitcoin: i64) -> bitcoin_units::SignedAmount
 pub const fn bitcoin_units::SignedAmount::from_sat(satoshi: i64) -> bitcoin_units::SignedAmount
+pub const fn bitcoin_units::SignedAmount::from_sat_unchecked(satoshi: i64) -> bitcoin_units::SignedAmount
 pub const fn bitcoin_units::SignedAmount::to_sat(self) -> i64
 pub const fn bitcoin_units::block::BlockHeight::from_u32(inner: u32) -> Self
 pub const fn bitcoin_units::block::BlockHeight::to_u32(self) -> u32
@@ -771,7 +772,7 @@ pub fn bitcoin_units::Amount::sum<I: core::iter::traits::iterator::Iterator<Item
 pub fn bitcoin_units::Amount::sum<I>(iter: I) -> Self where I: core::iter::traits::iterator::Iterator<Item = &'a bitcoin_units::Amount>
 pub fn bitcoin_units::Amount::to_btc(self) -> f64
 pub fn bitcoin_units::Amount::to_float_in(self, denom: bitcoin_units::amount::Denomination) -> f64
-pub fn bitcoin_units::Amount::to_signed(self) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::OutOfRangeError>
+pub fn bitcoin_units::Amount::to_signed(self) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::Amount::to_string_in(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::Amount::to_string_with_denomination(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::Amount::try_from(value: bitcoin_units::SignedAmount) -> core::result::Result<Self, Self::Error>
@@ -791,6 +792,7 @@ pub fn bitcoin_units::SignedAmount::div(self, rhs: i64) -> Self::Output
 pub fn bitcoin_units::SignedAmount::div_assign(&mut self, rhs: i64)
 pub fn bitcoin_units::SignedAmount::eq(&self, other: &bitcoin_units::SignedAmount) -> bool
 pub fn bitcoin_units::SignedAmount::fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+pub fn bitcoin_units::SignedAmount::from(value: bitcoin_units::Amount) -> Self
 pub fn bitcoin_units::SignedAmount::from_btc(btc: f64) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::ParseAmountError>
 pub fn bitcoin_units::SignedAmount::from_float_in(value: f64, denom: bitcoin_units::amount::Denomination) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::ParseAmountError>
 pub fn bitcoin_units::SignedAmount::from_int_btc<T: core::convert::Into<i64>>(whole_bitcoin: T) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::OutOfRangeError>
@@ -819,7 +821,6 @@ pub fn bitcoin_units::SignedAmount::to_float_in(self, denom: bitcoin_units::amou
 pub fn bitcoin_units::SignedAmount::to_string_in(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::SignedAmount::to_string_with_denomination(self, denom: bitcoin_units::amount::Denomination) -> alloc::string::String
 pub fn bitcoin_units::SignedAmount::to_unsigned(self) -> core::result::Result<bitcoin_units::Amount, bitcoin_units::amount::OutOfRangeError>
-pub fn bitcoin_units::SignedAmount::try_from(value: bitcoin_units::Amount) -> core::result::Result<Self, Self::Error>
 pub fn bitcoin_units::SignedAmount::unchecked_add(self, rhs: bitcoin_units::SignedAmount) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::SignedAmount::unchecked_sub(self, rhs: bitcoin_units::SignedAmount) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::SignedAmount::unsigned_abs(self) -> bitcoin_units::Amount
@@ -1116,7 +1117,6 @@ pub type bitcoin_units::Amount::Error = bitcoin_units::amount::OutOfRangeError
 pub type bitcoin_units::Amount::Output = bitcoin_units::Amount
 pub type bitcoin_units::Amount::Output = bitcoin_units::fee_rate::FeeRate
 pub type bitcoin_units::SignedAmount::Err = bitcoin_units::amount::ParseError
-pub type bitcoin_units::SignedAmount::Error = bitcoin_units::amount::OutOfRangeError
 pub type bitcoin_units::SignedAmount::Output = bitcoin_units::SignedAmount
 pub type bitcoin_units::amount::Denomination::Err = bitcoin_units::amount::ParseDenominationError
 pub type bitcoin_units::block::BlockHeight::Err = bitcoin_units::parse::ParseIntError
diff --git a/api/units/no-features.txt b/api/units/no-features.txt
index 17a93af28..48178dccc 100644
--- a/api/units/no-features.txt
+++ b/api/units/no-features.txt
@@ -141,6 +141,7 @@ impl core::cmp::PartialOrd for bitcoin_units::locktime::relative::Height
 impl core::cmp::PartialOrd for bitcoin_units::locktime::relative::Time
 impl core::cmp::PartialOrd for bitcoin_units::weight::Weight
 impl core::convert::AsRef<core::num::error::ParseIntError> for bitcoin_units::parse::ParseIntError
+impl core::convert::From<bitcoin_units::Amount> for bitcoin_units::SignedAmount
 impl core::convert::From<bitcoin_units::amount::InputTooLargeError> for bitcoin_units::amount::ParseAmountError
 impl core::convert::From<bitcoin_units::amount::InputTooLargeError> for bitcoin_units::amount::ParseError
 impl core::convert::From<bitcoin_units::amount::InvalidCharacterError> for bitcoin_units::amount::ParseAmountError
@@ -178,7 +179,6 @@ impl core::convert::TryFrom<&str> for bitcoin_units::locktime::absolute::Time
 impl core::convert::TryFrom<&str> for bitcoin_units::locktime::relative::Height
 impl core::convert::TryFrom<&str> for bitcoin_units::locktime::relative::Time
 impl core::convert::TryFrom<&str> for bitcoin_units::weight::Weight
-impl core::convert::TryFrom<bitcoin_units::Amount> for bitcoin_units::SignedAmount
 impl core::convert::TryFrom<bitcoin_units::SignedAmount> for bitcoin_units::Amount
 impl core::convert::TryFrom<bitcoin_units::block::BlockHeight> for bitcoin_units::locktime::absolute::Height
 impl core::convert::TryFrom<bitcoin_units::block::BlockInterval> for bitcoin_units::locktime::relative::Height
@@ -656,6 +656,7 @@ pub const fn bitcoin_units::SignedAmount::checked_rem(self, rhs: i64) -> core::o
 pub const fn bitcoin_units::SignedAmount::checked_sub(self, rhs: bitcoin_units::SignedAmount) -> core::option::Option<bitcoin_units::SignedAmount>
 pub const fn bitcoin_units::SignedAmount::from_int_btc_const(whole_bitcoin: i64) -> bitcoin_units::SignedAmount
 pub const fn bitcoin_units::SignedAmount::from_sat(satoshi: i64) -> bitcoin_units::SignedAmount
+pub const fn bitcoin_units::SignedAmount::from_sat_unchecked(satoshi: i64) -> bitcoin_units::SignedAmount
 pub const fn bitcoin_units::SignedAmount::to_sat(self) -> i64
 pub const fn bitcoin_units::block::BlockHeight::from_u32(inner: u32) -> Self
 pub const fn bitcoin_units::block::BlockHeight::to_u32(self) -> u32
@@ -749,7 +750,7 @@ pub fn bitcoin_units::Amount::sub_assign(&mut self, rhs: &bitcoin_units::Amount)
 pub fn bitcoin_units::Amount::sub_assign(&mut self, rhs: bitcoin_units::Amount)
 pub fn bitcoin_units::Amount::sum<I: core::iter::traits::iterator::Iterator<Item = Self>>(iter: I) -> Self
 pub fn bitcoin_units::Amount::sum<I>(iter: I) -> Self where I: core::iter::traits::iterator::Iterator<Item = &'a bitcoin_units::Amount>
-pub fn bitcoin_units::Amount::to_signed(self) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::OutOfRangeError>
+pub fn bitcoin_units::Amount::to_signed(self) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::Amount::try_from(value: bitcoin_units::SignedAmount) -> core::result::Result<Self, Self::Error>
 pub fn bitcoin_units::Amount::unchecked_add(self, rhs: bitcoin_units::Amount) -> bitcoin_units::Amount
 pub fn bitcoin_units::Amount::unchecked_sub(self, rhs: bitcoin_units::Amount) -> bitcoin_units::Amount
@@ -767,6 +768,7 @@ pub fn bitcoin_units::SignedAmount::div(self, rhs: i64) -> Self::Output
 pub fn bitcoin_units::SignedAmount::div_assign(&mut self, rhs: i64)
 pub fn bitcoin_units::SignedAmount::eq(&self, other: &bitcoin_units::SignedAmount) -> bool
 pub fn bitcoin_units::SignedAmount::fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+pub fn bitcoin_units::SignedAmount::from(value: bitcoin_units::Amount) -> Self
 pub fn bitcoin_units::SignedAmount::from_int_btc<T: core::convert::Into<i64>>(whole_bitcoin: T) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::OutOfRangeError>
 pub fn bitcoin_units::SignedAmount::from_str(s: &str) -> core::result::Result<Self, Self::Err>
 pub fn bitcoin_units::SignedAmount::from_str_in(s: &str, denom: bitcoin_units::amount::Denomination) -> core::result::Result<bitcoin_units::SignedAmount, bitcoin_units::amount::ParseAmountError>
@@ -789,7 +791,6 @@ pub fn bitcoin_units::SignedAmount::sub_assign(&mut self, rhs: bitcoin_units::Si
 pub fn bitcoin_units::SignedAmount::sum<I: core::iter::traits::iterator::Iterator<Item = Self>>(iter: I) -> Self
 pub fn bitcoin_units::SignedAmount::sum<I>(iter: I) -> Self where I: core::iter::traits::iterator::Iterator<Item = &'a bitcoin_units::SignedAmount>
 pub fn bitcoin_units::SignedAmount::to_unsigned(self) -> core::result::Result<bitcoin_units::Amount, bitcoin_units::amount::OutOfRangeError>
-pub fn bitcoin_units::SignedAmount::try_from(value: bitcoin_units::Amount) -> core::result::Result<Self, Self::Error>
 pub fn bitcoin_units::SignedAmount::unchecked_add(self, rhs: bitcoin_units::SignedAmount) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::SignedAmount::unchecked_sub(self, rhs: bitcoin_units::SignedAmount) -> bitcoin_units::SignedAmount
 pub fn bitcoin_units::SignedAmount::unsigned_abs(self) -> bitcoin_units::Amount
@@ -1070,7 +1071,6 @@ pub type bitcoin_units::Amount::Error = bitcoin_units::amount::OutOfRangeError
 pub type bitcoin_units::Amount::Output = bitcoin_units::Amount
 pub type bitcoin_units::Amount::Output = bitcoin_units::fee_rate::FeeRate
 pub type bitcoin_units::SignedAmount::Err = bitcoin_units::amount::ParseError
-pub type bitcoin_units::SignedAmount::Error = bitcoin_units::amount::OutOfRangeError
 pub type bitcoin_units::SignedAmount::Output = bitcoin_units::SignedAmount
 pub type bitcoin_units::amount::Denomination::Err = bitcoin_units::amount::ParseDenominationError
 pub type bitcoin_units::block::BlockHeight::Err = bitcoin_units::parse::ParseIntError
diff --git a/bitcoin/src/blockdata/transaction.rs b/bitcoin/src/blockdata/transaction.rs
index 84c53de7e..5dea49ba9 100644
--- a/bitcoin/src/blockdata/transaction.rs
+++ b/bitcoin/src/blockdata/transaction.rs
@@ -790,8 +790,8 @@ pub fn effective_value(
     value: Amount,
 ) -> Option<SignedAmount> {
     let weight = satisfaction_weight.checked_add(TX_IN_BASE_WEIGHT)?;
-    let signed_input_fee = fee_rate.checked_mul_by_weight(weight)?.to_signed().ok()?;
-    value.to_signed().ok()?.checked_sub(signed_input_fee)
+    let signed_input_fee = fee_rate.checked_mul_by_weight(weight)?.to_signed();
+    value.to_signed().checked_sub(signed_input_fee)
 }
 
 /// Predicts the weight of a to-be-constructed transaction.
@@ -1673,7 +1673,7 @@ mod tests {
 
         // 10 sat/kwu * (204wu + BASE_WEIGHT) = 4 sats
         let expected_fee = "4 sats".parse::<SignedAmount>().unwrap();
-        let expected_effective_value = value.to_signed().unwrap() - expected_fee;
+        let expected_effective_value = value.to_signed() - expected_fee;
         assert_eq!(effective_value, expected_effective_value);
     }
 
diff --git a/units/src/amount/signed.rs b/units/src/amount/signed.rs
index 2faa7e45f..3c9df7f60 100644
--- a/units/src/amount/signed.rs
+++ b/units/src/amount/signed.rs
@@ -83,6 +83,15 @@ impl SignedAmount {
     /// ```
     pub const fn to_sat(self) -> i64 { self.0 }
 
+    /// Constructs a new [`SignedAmount`] with satoshi precision and the given number of satoshis.
+    ///
+    /// Caller to guarantee that `satoshi` is within valid range.
+    ///
+    /// See [`Self::MIN`] and [`Self::MAX_MONEY`].
+    pub const fn from_sat_unchecked(satoshi: i64) -> SignedAmount {
+        SignedAmount(satoshi)
+    }
+
     /// Converts from a value expressing a decimal number of bitcoin to a [`SignedAmount`].
     ///
     /// # Errors
@@ -557,10 +566,11 @@ impl FromStr for SignedAmount {
     }
 }
 
-impl TryFrom<Amount> for SignedAmount {
-    type Error = OutOfRangeError;
-
-    fn try_from(value: Amount) -> Result<Self, Self::Error> { value.to_signed() }
+impl From<Amount> for SignedAmount {
+    fn from(value: Amount) -> Self {
+        let v = value.to_sat() as i64; // Cast ok, signed amount and amount share positive range.
+        SignedAmount::from_sat_unchecked(v)
+    }
 }
 
 impl core::iter::Sum for SignedAmount {
diff --git a/units/src/amount/tests.rs b/units/src/amount/tests.rs
index d5e939477..19b32ffec 100644
--- a/units/src/amount/tests.rs
+++ b/units/src/amount/tests.rs
@@ -71,13 +71,6 @@ fn from_int_btc() {
     assert_eq!(Amount::from_sat(200_000_000), amt);
 }
 
-#[test]
-fn test_signed_amount_try_from_amount() {
-    let ua_positive = Amount::from_sat(123);
-    let sa_positive = SignedAmount::try_from(ua_positive).unwrap();
-    assert_eq!(sa_positive, SignedAmount::from_sat(123));
-}
-
 #[test]
 fn test_amount_try_from_signed_amount() {
     let sa_positive = SignedAmount::from_sat(123);
@@ -473,12 +466,11 @@ fn test_unsigned_signed_conversion() {
     let ua = Amount::from_sat;
     let max_sats: u64 = Amount::MAX.to_sat();
 
-    assert_eq!(ua(max_sats).to_signed(), Ok(sa(max_sats as i64)));
-    assert_eq!(ua(i64::MAX as u64 + 1).to_signed(), Err(OutOfRangeError::too_big(true)));
+    assert_eq!(ua(max_sats).to_signed(), sa(max_sats as i64));
 
     assert_eq!(sa(max_sats as i64).to_unsigned(), Ok(ua(max_sats)));
 
-    assert_eq!(sa(max_sats as i64).to_unsigned().unwrap().to_signed(), Ok(sa(max_sats as i64)));
+    assert_eq!(sa(max_sats as i64).to_unsigned().unwrap().to_signed(), sa(max_sats as i64));
 }
 
 #[test]
diff --git a/units/src/amount/unsigned.rs b/units/src/amount/unsigned.rs
index e7b214189..9ee8d8cc0 100644
--- a/units/src/amount/unsigned.rs
+++ b/units/src/amount/unsigned.rs
@@ -438,17 +438,9 @@ impl Amount {
     pub fn unchecked_sub(self, rhs: Amount) -> Amount { Self(self.0 - rhs.0) }
 
     /// Converts to a signed amount.
-    ///
-    /// # Errors
-    ///
-    /// If the amount is too big.
     #[rustfmt::skip] // Moves code comments to the wrong line.
-    pub fn to_signed(self) -> Result<SignedAmount, OutOfRangeError> {
-        if self.to_sat() > SignedAmount::MAX.to_sat() as u64 { // Cast ok, signed max is positive and fits in u64.
-            Err(OutOfRangeError::too_big(true))
-        } else {
-            Ok(SignedAmount::from_sat(self.to_sat() as i64)) // Cast ok, checked not too big above.
-        }
+    pub fn to_signed(self) -> SignedAmount {
+        SignedAmount::from_sat_unchecked(self.to_sat() as i64) // Cast ok, signed amount and amount share positive range.
     }
 
     /// Checks if the amount is below the maximum value. Returns `None` if it is above.