Standard monthly
- Total interest
- Payoff
A smarter mortgage starts with understanding it.
See where your money goes—and how a little extra
today can buy back years of tomorrow.
National mortgage benchmark + state cost estimates. Checks run automatically when you open this page. Editing a figure makes it your value, protected from automatic updates.
Planning assumption for bonds / local charges; replace with a parcel estimate.
Calculated from starting loan balance; not a live quote.
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Projection from the selected starting balance, not a record of actual payments. Extra contributions include the lump sum; down payment and past payments are excluded.
Change this goal to update every projection immediately. Changing extra principal switches back to exploring, with your goal kept for comparison.
Fixed note rate, monthly interest at rate ÷ 12, payments at month-end, extra principal from the first projected payment, and the lump sum before the first interest calculation. Final payments are capped at the remaining balance plus interest. Figures use unrounded calculations; entered goal payments round up to cents. Actual servicing and rounding can differ.
Biweekly equivalent annualizes 26 half-payments as 13 monthly P&I payments: one extra P&I payment spread over 12 months. Extra selected in biweekly mode is also annualized (26 × extra ÷ 12). This is a monthly approximation, not a date-by-date biweekly schedule or a promise of immediate partial-payment credit. Your servicer’s timing, escrow handling, and fees matter.
Loan totals include principal, interest, and the entered lump sum. They exclude down payment, property taxes, homeowners insurance, HOA, PMI/MIP, closing costs, prepayment fees, tax deductions, inflation, and investment returns. The separate monthly housing budget adds entered taxes, insurance, mortgage insurance, HOA, and other reserves once. These remain flat estimates; mortgage insurance is budgeted until loan payoff, with no early cancellation simulated. Taxes, homeowners insurance, HOA and reserves continue after payoff. Escrow routes taxes and homeowners insurance through the servicer instead of counting them as an additional fee. Savings are future nominal interest avoided versus the same loan with minimum payments. Principal owed is repaid, not forgiven. Existing-loan projections exclude past payments. No rate changes, refinancing, recasts, or automatic PMI cancellation are modeled. Goal mode solves the recurring extra needed and rounds up to the next cent; it recalculates when loan inputs change. In exploration mode the goal shows the remaining recurring-payment gap or an alternative additional lump sum today.
Live comparisons using your loan inputs.
See how each strategy changes interest and payoff.
These are three payment-strategy presets for the mortgage you entered above. Loan amount, interest rate and upfront principal stay the same. Each preset replaces your custom recurring top-up with its own payment schedule. Choose Apply & view chart to update your plan and jump to the chart, payment totals and payoff date.
26 × half a monthly payment = 13 full payments per year. Twice monthly is 24 halves = 12 full payments and adds no annual extra by itself. These comparisons isolate frequency: your selected lump sum is included in all three; your optional recurring top-up is excluded. Only P&I is split here. Escrow and insurance collection rules depend on your servicer.
The two-week plan is modeled as monthly P&I + P&I ÷ 12. Monthly + the same annual top-up has the same curve in this approximation. Actual payment dates and crediting can change results; splitting a payment alone does not guarantee earlier principal credit. Ask how partial payments are held and applied. [1]
Interest is the cost of borrowing.
Principal is the part that makes the home yours.
Your required P&I payment already repays some debt. An optional top-up repays more of that same debt. Both are counted together as principal; only interest is the borrowing cost.
These two benefits compare with the same loan and lump sum, without recurring top-ups. Your optional top-up usually shortens the loan while the required monthly P&I stays the same. Taxes, insurance and HOA do not repay debt.
| Strategy | Loan / month | Full housing / month | Payoff time | Total interest | Interest saved |
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Click a strategy to apply it to the entire planner. Presets and the goal use your selected lump sum; “Minimum only” excludes it. Biweekly is a monthly approximation. All rows share your loan inputs.
Less interest is a goal.
A resilient financial life is the bigger one.
Make every required payment on time. Keep emergency cash and a home-repair reserve. Capture an employer retirement match and weigh higher-interest debt before accelerating a mortgage.
Ask how to designate principal-only payments and keep making the full scheduled payment, including escrow. Confirm the extra reduced principal on the next statement instead of merely advancing the due date. Check your note for penalties, thresholds, and fees before making a large payment. [5]
Every two weeks means 26 half-payments a year—the equivalent of 13 full payments. Twice a month means 24 halves, or 12 full payments. The extra annual amount is the main benefit. A monthly principal top-up of P&I ÷ 12 creates a comparable annual commitment, with timing differences. Partial payments can be held until the full amount including escrow is available. Ask about crediting, fees, and three-draft months; avoid paying a third party just to automate extra principal. [1]
Start with a comfortable extra amount. Automate it using the servicer’s designated principal field, then review after raises or bonuses. Earlier principal reductions save more than the same reduction later, all else equal. Pause optional extras when cash is tight; required payments still come first. Recheck instructions if servicing transfers. [6]
For many conventional loans, you can request PMI cancellation in writing at 80% of original value, including when extra principal gets you there early. Payment history, current status, liens, and value requirements apply. Automatic termination generally uses the scheduled 78% date while current, not simply today’s actual balance. FHA mortgage insurance and lender-paid insurance follow different rules. Mortgage-insurance premiums are included in the separate housing budget; early-cancellation savings are not modeled. [2]
Compare refinance Loan Estimates, closing costs, and interest over your expected ownership period. A lower payment from restarting a 30-year clock can hide higher lifetime cost. Costs ÷ monthly savings is a rough cash-flow break-even, not a full economic comparison. A recast, when available, recalculates required payments after a lump sum while retaining the rate and remaining term; ask about minimums and fees. For fastest payoff, continuing the old payment usually beats paying only the recast minimum. [3] [4] [5]
Extra principal avoids future interest at the loan rate before tax effects; it also locks cash into the home. Compare that with after-tax safe yields, liquidity needs, and uncertain investment returns. Deductibility depends on your actual tax situation. A low-rate mortgage can reasonably coexist with long-term investing; a higher rate makes prepayment more compelling. Neither choice is universal.
For a future purchase, compare Loan Estimates for the same loan type, term, and lock period. Review the note rate, APR, points, fees, mortgage insurance, and prepayment terms together. A shorter term can lower total interest but raises the required payment; a longer term with optional extras offers flexibility. Don’t stretch the purchase budget just because a calculator allows it. [3]
The company collecting your payments may be different from the bank that originated the loan. Get its answers in writing.
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