Finance category
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Refinance vs Recast Calculator
Decide whether to refinance your mortgage at a new rate or keep the current loan and recast it with a lump-sum principal payment. See payment, interest, and break-even for each path.
Current mortgage
Recast scenario (keep current loan)
Typical recast fees: $150–$500.
Refinance scenario (replace loan)
Current loan
$2,253
monthly payment
Total interest: $410,108
Recast
$1,972
monthly payment after lump
Save $282/mo
Total interest after recast: $358,845
Refinance
$1,970
monthly payment on new loan
Save $283/mo
Total interest: $389,306
Decision framework
Refinance break-even: 23 months to recover $6,500 in closing costs.
A recast keeps your current rate and term intact, just lowering the payment by re-amortizing the reduced balance. It makes sense when current rates are higher than yours but you have cash to deploy. A refinance is usually better when rates have dropped materially and you plan to stay long enough to clear closing costs.
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Refinance vs Recast Calculator is built to give a quick, browser-based estimate for refinance vs recast. Decide whether to refinance your mortgage at a new rate or keep the current loan and recast it with a lump-sum principal payment. See payment, interest, and break-even for each path. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the refinance vs recast result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this refinance vs recast estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter your current mortgage balance, rate, and years remaining to set the baseline payment.
- For the recast scenario, enter the lump-sum principal payment and the recast fee.
- For the refinance scenario, enter the new rate, term, and total closing costs.
- Compare new monthly payment, total interest, and the months required to recover refinance closing costs.
- Pick recast when your current rate is already competitive and you have cash; pick refinance when rates have dropped meaningfully and you'll stay long enough.
Frequently Asked Questions
What does a mortgage recast do?
A recast keeps the existing mortgage (same rate, same term) but lowers the monthly payment by re-amortizing the reduced balance after a lump-sum principal payment. Most lenders charge a small fee and require a minimum lump sum (often $5k–$10k).
When is a refinance better than a recast?
Refinance wins when market rates are meaningfully below your current rate and you'll stay in the loan long enough to recover closing costs. Recast wins when your current rate is already competitive and you just want to reduce the payment with cash.
Can I recast any mortgage?
Most conforming conventional mortgages allow recasting. Government-backed loans (FHA, VA, USDA) usually do not. Check your note or ask your servicer before planning on a recast.
Does a recast save interest?
Yes, because the balance is lower. Total interest paid over the remainder of the term drops materially, even though the rate and payoff date don't change. A refinance can save more if the rate drops are large enough.
Related Calculators
Mortgage Recast Calculator
Run the recast math standalone with full amortization detail.
Refinance Calculator
Compare a refinance against your current loan terms.
Refinance Break-Even Calculator
Calculate the months to recover refinance closing costs.
Mortgage Calculator
Base mortgage payment math behind all refinance and recast comparisons.
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