diff --git a/src/test/app/Loan_test.cpp b/src/test/app/Loan_test.cpp
index aa196d0e65..e4a9b71854 100644
--- a/src/test/app/Loan_test.cpp
+++ b/src/test/app/Loan_test.cpp
@@ -6145,15 +6145,16 @@ protected:
         // Accrued + prepayment-penalty interest based on current periodic
         // schedule
         auto const fullPaymentInterest = computeFullPaymentInterest(
-            after.periodicPayment,
+            detail::loanPrincipalFromPeriodicPayment(
+                after.periodicPayment, periodicRate2, after.paymentRemaining),
             periodicRate2,
-            after.paymentRemaining,
             env.current()->parentCloseTime(),
             after.paymentInterval,
             after.previousPaymentDate,
             static_cast<std::uint32_t>(
                 after.startDate.time_since_epoch().count()),
             closeInterestRate);
+
         // Round to asset scale and split interest/fee parts
         auto const roundedInterest =
             roundToAsset(asset.raw(), fullPaymentInterest, after.loanScale);
@@ -6181,9 +6182,9 @@ protected:
         // window by clamping prevPaymentDate to 'now' for the full-pay path.
         auto const prevClamped = std::min(after.previousPaymentDate, nowSecs);
         auto const fullPaymentInterestClamped = computeFullPaymentInterest(
-            after.periodicPayment,
+            detail::loanPrincipalFromPeriodicPayment(
+                after.periodicPayment, periodicRate2, after.paymentRemaining),
             periodicRate2,
-            after.paymentRemaining,
             env.current()->parentCloseTime(),
             after.paymentInterval,
             prevClamped,
diff --git a/src/xrpld/app/misc/LendingHelpers.h b/src/xrpld/app/misc/LendingHelpers.h
index b8f9944643..342cb3e58f 100644
--- a/src/xrpld/app/misc/LendingHelpers.h
+++ b/src/xrpld/app/misc/LendingHelpers.h
@@ -202,14 +202,6 @@ computeRawLoanState(
     std::uint32_t const paymentRemaining,
     TenthBips32 const managementFeeRate);
 
-LoanState
-computeRawLoanState(
-    Number const& periodicPayment,
-    TenthBips32 interestRate,
-    std::uint32_t paymentInterval,
-    std::uint32_t const paymentRemaining,
-    TenthBips32 const managementFeeRate);
-
 // Constructs a valid LoanState object from arbitrary inputs
 LoanState
 constructLoanState(
@@ -239,17 +231,6 @@ computeFullPaymentInterest(
     std::uint32_t startDate,
     TenthBips32 closeInterestRate);
 
-Number
-computeFullPaymentInterest(
-    Number const& periodicPayment,
-    Number const& periodicRate,
-    std::uint32_t paymentRemaining,
-    NetClock::time_point parentCloseTime,
-    std::uint32_t paymentInterval,
-    std::uint32_t prevPaymentDate,
-    std::uint32_t startDate,
-    TenthBips32 closeInterestRate);
-
 namespace detail {
 // These classes and functions should only be accessed by LendingHelper
 // functions and unit tests
diff --git a/src/xrpld/app/misc/detail/LendingHelpers.cpp b/src/xrpld/app/misc/detail/LendingHelpers.cpp
index 2068f460cc..76125bdcc0 100644
--- a/src/xrpld/app/misc/detail/LendingHelpers.cpp
+++ b/src/xrpld/app/misc/detail/LendingHelpers.cpp
@@ -1403,30 +1403,6 @@ computeFullPaymentInterest(
     return accruedInterest + prepaymentPenalty;
 }
 
-Number
-computeFullPaymentInterest(
-    Number const& periodicPayment,
-    Number const& periodicRate,
-    std::uint32_t paymentRemaining,
-    NetClock::time_point parentCloseTime,
-    std::uint32_t paymentInterval,
-    std::uint32_t prevPaymentDate,
-    std::uint32_t startDate,
-    TenthBips32 closeInterestRate)
-{
-    Number const rawPrincipalOutstanding =
-        detail::loanPrincipalFromPeriodicPayment(
-            periodicPayment, periodicRate, paymentRemaining);
-
-    return computeFullPaymentInterest(
-        rawPrincipalOutstanding,
-        periodicRate,
-        parentCloseTime,
-        paymentInterval,
-        prevPaymentDate,
-        startDate,
-        closeInterestRate);
-}
 
 /* Calculates the theoretical loan state at maximum precision for a given point
  * in the amortization schedule.
@@ -1489,21 +1465,6 @@ computeRawLoanState(
         .managementFeeDue = rawManagementFeeOutstanding};
 };
 
-LoanState
-computeRawLoanState(
-    Number const& periodicPayment,
-    TenthBips32 interestRate,
-    std::uint32_t paymentInterval,
-    std::uint32_t const paymentRemaining,
-    TenthBips32 const managementFeeRate)
-{
-    return computeRawLoanState(
-        periodicPayment,
-        loanPeriodicRate(interestRate, paymentInterval),
-        paymentRemaining,
-        managementFeeRate);
-}
-
 /* Constructs a LoanState from rounded Loan ledger object values.
  *
  * This function creates a LoanState structure from the three tracked values