Property

Mortgage Overpayment Calculator

Interest saved and months shaved with extra monthly payments.

Use the interactive calculator below for an instant estimate. Results depend on your inputs and the assumptions shown on the page.

Methodology and source status

Scope: Property, mortgage, landlord, and home-moving estimates; tax rules vary across UK nations.

Primary reference: HMRC rates and thresholds for employers.

Source record: Direct statutory or government source. This link is the calculator-specific evidence path, not a statement that every individual input or exception is current.

Effective period: The linked HMRC page covers 2025/26 payroll figures unless it states otherwise. Check the applicable period, pay frequency, tax code and status before relying on an estimate.

Review status: Source path published; no named calculator-level review is currently represented here.

Last source or expert review: No calculator-level source or expert review date is published.

Technical validation: 12 August 2026 — catalogue build, route, metadata, and internal-link checks completed. This is a technical delivery check, not a review of current rates, rules, sources, calculations, or personal circumstances.

Next review trigger: Review when a relevant rate, threshold, provider fee, tax period, rule, or formula changes.