Mortgage Recast Calculator
Compare the current payment with a re-amortized payment after applying a lump sum.
Verify this calculatorVerified
See what the result uses—and what it cannot know.
Sumvoro calculates deterministically from the visible inputs. It does not invent lender terms, local rules, market values, medical facts, or professional judgments.
- 1 · InputsCheck every entered value against the latest statement, quote, measurement, or official source.
- 2 · Formula
The remaining balance after the lump sum is re-amortized over the unchanged remaining term and rate. - 3 · SensitivityUse Insights to run a lower and higher case. If the conclusion changes easily, collect better information or leave more margin.
- 4 · ScopeThis tool is maintained and covered by automated calculation tests. Provider timing, rounding, and omitted facts can still change a real-world result.
- Formula release
- 2026.10-r4
- Release date
- October 10, 2026
- Review status
- Verified
- Source review
- October 10, 2026
Mortgage Recast calculator
A recast spreads the reduced principal over the remaining term at the assumed unchanged rate. It is different from refinancing and still requires cash for the lump sum.
- Confirm eligibility and terms with the actual servicer.
- Keep cash reserves outside the proposed lump sum.
- The reported payment is principal and interest; escrow may remain separate.
Optional readingLearn how this calculator works
How the mortgage recast calculator works
Estimate the payment reduction after a principal lump sum and mortgage recast.
The remaining balance after the lump sum is re-amortized over the unchanged remaining term and rate.
Read our calculation methodology and limitations.
Example
Start with the example scenario, then replace each clearly labeled field with values from your property, statement, quote, or project budget.
What happens to my payment after a $50,000 principal lump sum?
- Current principal balance
- $320,000
- Interest rate
- 6.25 %
- Payments remaining
- 300 months
- Principal lump sum
- $50,000
- Recast fee
- $250
- Estimated new payment
- $1,781.11
- Monthly payment reduction
- $329.83
- Remaining scheduled-payment savings
- $98,700.41
- Cash required now
- $50,250.00
A recast keeps the assumed rate and remaining term. Payment relief does not mean the lump sum was free.
These are fictional, editable assumptions—not market quotes or personal advice.
What affects the result
- The interest rate and maturity usually remain unchanged.
- The lender must permit and process the recast.
- A fee and minimum lump sum may apply.
Frequently asked questions
What should I verify before relying on this?
Confirm property value, loan terms, costs, taxes, and local requirements with primary documents and the appropriate lender or professional.
Does Sumvoro save my property data?
The scenario stays locally in your browser unless you deliberately use a sharing or reporting action.