calculating the principal balance over time, taking into account the effects of charges, interest and fee

functions for handling received payments and calculating interest and/or charges where necessary

calculating the APR according to various country-specific regulations

convenience functions and options to help with calculations

a penalty charge

NB: differences between charge and fee: - a charge is not an up-front amount, it is incurred as a result of a breach of agreed terms - a charge is not added to the principal balance and does not therefore accrue interest

a .NET Framework polyfill equivalent to the DateOnly structure in .NET Core

a product fee

NOTE: differences between fee and charge: - a fee is an up-front amount paid under agreed terms for receiving an advance - a fee is added to the principal balance and therefore accrues interest

convenience module for generating HTML tables, optimised for amortisation schedules

convenience module for generating HTML tables, optimised for amortisation schedules

methods for calculating interest and unambiguously expressing interest rates, as well as enforcing regulatory caps on interest chargeable

functions for settling outstanding payments

functions for rescheduling payments after an original schedule failed to amortise

functions for generating a regular payment schedule, with payment amounts, interest and APR

an unambiguous way to represent regular date intervals and generate schedules based on them

note: unit-period definitions are based on US federal legislation but the definitions are universally applicable