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Mortgage loan modification calculator

Estimate a proposed modified principal and interest payment, capitalized arrears, deferred balance due later, long-term interest, horizon balance, and trial payment affordability before relying on written servicer terms.

Runs in your browser No signup Principal and interest only Written servicer terms control Transparent methodology Affiliate links disclosed

Current loan

Leave blank or zero to calculate from balance, rate, and term.

Proposed modification

Modeled as due later, not amortized monthly.

This is not a modification approval tool. It models principal and interest only and cannot determine eligibility, credit reporting, escrow, foreclosure, or program treatment.

Current P&I payment
Modified P&I payment
Monthly change
Budget check
Capitalized balance
Deferred due later
Full-term cash change
Horizon balance change
ScenarioMonthly P&IInterest through horizonBalance at horizonFull-term interestFull-term cash outHow to read it

Methodology notes

Current path

The calculator uses your current P&I payment if entered. Otherwise it calculates a payment from the unpaid principal balance, current rate, and remaining months.

Modified balance

Past-due arrears and fees are added to principal. The deferral amount is then removed from the amortizing balance and shown as a separate amount due later.

Cost comparison

Full-term cash out compares remaining current P&I plus modeled arrears against modified P&I plus the deferred amount. Escrow, taxes, insurance, and legal fees are excluded.

Results are estimates for educational purposes only and are not financial, legal, tax, credit, servicing, or foreclosure advice. Written servicer agreements, official notices, investor or agency rules, mortgage documents, and applicable law control. See full disclosure.

Important caveats

Mortgage loan modification FAQ

Should I include escrow in the payment?

No. Enter the principal and interest payment here, then separately review escrow, taxes, insurance, shortages, and fees in the servicer's written offer.

What if my trial payment is different?

Use the trial payment budget field to test affordability, but rely on the servicer's trial-plan amount and due dates. Ask whether trial payments are applied, suspended, or posted after completion.

Is deferred principal forgiven?

Usually it is not forgiven unless the written program says so. Deferred amounts may be due later and can affect payoff, sale proceeds, refinance, maturity, or transfer.

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