Temporary Mortgage Buydown vs Permanent Points Analyzer
Introduction
Choosing a mortgage rate structure is not only about finding the lowest advertised interest rate. It is really a decision about timing. A temporary buydown can reduce the payment in the first year or two, which may help a buyer ease into homeownership or make a monthly budget work during a period of transition. Permanent discount points do something different: they require more cash at closing in exchange for a lower note rate that lasts for the full loan term. A lender credit moves in the opposite direction by reducing upfront cash needs, often at the cost of a higher rate and payment. This calculator brings those tradeoffs together so you can compare them with the same loan amount, term, and planning horizon.
That side-by-side view matters because mortgage choices are easy to misunderstand when they are presented one quote at a time. A temporary buydown can look attractive because the first-year payment is lower. Points can look attractive because the long-run payment is lower. A lender credit can look attractive because closing costs are easier to manage. All three statements can be true at once. The real question is which benefit matters most in your situation and whether the upfront cost is recovered before you refinance, sell, or pay off the loan. This page is designed to answer that practical question in plain numbers.
The calculator is especially useful when you want to move beyond rules of thumb. Some borrowers hear that points are only worth paying if they will keep the loan for many years. Others hear that temporary buydowns are best when a seller or builder is funding the subsidy. Those ideas can be directionally helpful, but they are not complete answers. The better approach is to test your own assumptions. If you expect to keep the mortgage for five years, compare five years. If you think refinancing is likely but not certain, run several horizons and see how the recommendation changes. That is where this tool is most valuable.
How to use this calculator
Start by entering the loan amount, loan term, and market rate. These fields establish the baseline mortgage payment before any temporary subsidy, permanent rate reduction, or lender credit is considered. The loan amount should be the amount borrowed, not the home price. The term is usually 15 or 30 years for a fixed-rate mortgage. The market rate is the comparison rate you would use if you took the loan without paying points and without a temporary buydown.
Next, enter the pricing adjustments you want to compare. The discount points paid field is a percentage of the loan amount. One point generally equals 1% of the loan balance paid upfront. The rate reduction per point field estimates how much each point lowers the permanent rate. Because real lender pricing is not perfectly linear, this is an approximation, but it is a useful one for planning. The lender credit field is also entered as a percentage of the loan amount and is treated as an upfront offset in the permanent-points comparison.
Then choose the temporary buydown structure. Common patterns include 3-2-1, 2-1, and 1-0. A 2-1 buydown means the effective rate is reduced by 2 percentage points in year one and 1 percentage point in year two before returning to the market rate. If your quote uses a different pattern, select the custom option and enter reductions as a comma-separated list such as 1.5,1.0,0.5. The temporary buydown upfront cost field captures the dollars required to fund that subsidy. Even if the seller, builder, or lender is paying it, the cost still matters because it is part of the overall economics of the deal.
Finally, choose the analysis horizon. This is one of the most important inputs on the page because it tells the calculator how long to compare savings. If you expect to refinance or move within a few years, a shorter horizon may be more realistic than the full loan term. If you expect to keep the mortgage for a long time, a longer horizon gives permanent points more time to recover their upfront cost. After entering your assumptions, click Analyze to generate the summary and the year-by-year table. If you want to start over, use the Reset button.
Formula
The baseline monthly payment is calculated with the standard fixed-rate mortgage payment formula. The annual interest rate is converted to a monthly rate, and the payment is calculated over the full number of monthly installments in the loan term. This same payment formula is used for the market-rate baseline, the floated-rate scenario, the permanent-points scenario, and each year of the temporary buydown schedule.
In this formula, M is the monthly payment, P is the principal, r is the monthly interest rate, and n is the total number of monthly payments. For the permanent-points path, the calculator reduces the market rate by multiplying the number of points by the estimated rate reduction per point. That gives a simplified permanent rate for comparison purposes.
For the temporary buydown path, the calculator subtracts the scheduled reduction from the market rate in each year of the buydown. It then compares the resulting payment with the baseline market-rate payment and adds the annual savings over the years in your chosen horizon. The net result is the cumulative payment relief minus the upfront buydown cost. For permanent points, the calculator compares the lower permanent payment with the baseline payment over the analysis horizon, then subtracts the points cost and adds any lender credit.
The floating-rate scenario is simpler. It shows what happens to the payment if rates move by the amount you entered before locking. That output is not a full savings path; it is a quick way to see the monthly risk or benefit of waiting. Together, these formulas keep the comparison transparent and focused on the cash-flow questions most borrowers care about.
Worked example
Suppose you are borrowing $450,000 on a 30-year fixed mortgage at a 6.5% market rate. You are comparing a 2-1 temporary buydown that costs $8,000 with a permanent-points option where you pay 1.5 points and each point lowers the rate by 0.25 percentage points. You also want to judge the options over five years because you think refinancing is possible, but you are not comfortable assuming it will definitely happen.
In that example, the temporary buydown usually creates the largest payment relief at the beginning. The first year benefits from a rate that is 2 percentage points below the market rate, and the second year benefits from a rate that is 1 percentage point below the market rate. That can be helpful if your budget is tight right after closing, if you expect income to rise, or if a seller is offering concessions and you want to use them to reduce the early payment burden.
The permanent-points option works differently. The monthly savings may be smaller at first than the temporary buydown savings, but they continue for every month you keep the loan. If you stay in the mortgage long enough, those steady savings may eventually recover the upfront points cost and move ahead. Whether that happens within five years depends on the size of the rate reduction, the cost of the points, and the actual hold period. That is why the same quote can look smart in one scenario and less appealing in another.
How to interpret the results
The results summary starts with the baseline monthly payment at the market rate. It then reports how much the temporary buydown saves over your selected horizon before costs and what remains after subtracting the upfront buydown cost. Next, it shows the permanent-points payment, the adjusted rate, and the net impact after points cost and lender credit are included. The final sentence shows how much the payment would change if rates moved by the amount you entered in the floating scenario.
A positive net figure means the option produced more payment savings than upfront cost over the years you selected. A negative net figure means the upfront cost was not fully recovered within that horizon. That does not automatically make the option a bad choice. A temporary buydown may still be worthwhile if someone else is funding it or if the lower early payment solves a real affordability problem. Permanent points may still be worthwhile if you strongly value payment stability and expect to keep the loan longer than your initial estimate. The calculator helps you see the tradeoff clearly, but your priorities still matter.
The year-by-year table is especially useful for temporary buydowns because it shows when the subsidy fades and how cumulative savings build relative to the market-rate baseline. If you are concerned about payment shock, pay close attention to the year when the effective rate returns to the market rate. If you are comparing seller concessions, the table can also help explain why the same concession dollars may feel more useful as a temporary buydown for one borrower and more useful as permanent points or closing-cost relief for another.
Assumptions and limitations
This tool is intentionally focused on payment comparison and upfront cash tradeoffs. It does not model taxes, mortgage insurance changes, refinancing fees, investment returns on unused cash, or every detail of a lender's internal pricing worksheet. It also uses a simplified fixed-rate payment approach for each scenario. That makes the output easier to understand, but it also means the calculator should be treated as a planning aid rather than a substitute for an official loan estimate.
A practical way to use the calculator is to run several realistic scenarios instead of relying on one answer. Try a short hold period, a medium hold period, and a longer hold period. If the same option looks best across all three, your decision may be fairly robust. If the winner changes when you move from five years to seven years, that is a sign the decision depends heavily on how long you keep the mortgage. In that case, the most important question may not be which quote is best today, but how confident you are in your future plans.
Buydown vs Points Cash Flow by Year
The table below summarizes the temporary buydown path year by year and then adds a short floating-rate note. Use it to see when the temporary subsidy fades, how the effective rate changes, and how cumulative savings build relative to the market-rate baseline. This is especially helpful when you want to explain the timing of savings to a co-borrower, agent, or client.
| Year | Scenario | Effective Rate (%) | Monthly Payment ($) | Cumulative Cash Flow vs Market ($) |
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Practical notes for buyers, sellers, and loan shoppers
Temporary buydowns are often most appealing when someone other than the borrower is funding the subsidy. Builders and sellers may prefer them because they can advertise a lower starting payment without reducing the headline price as aggressively. Buyers may prefer them because the first-year payment can feel much more manageable. Even so, the lower payment is temporary, so it is important to ask whether the future reset will still fit the household budget if refinancing never happens.
Permanent points are usually easier to justify when the borrower expects to keep the mortgage for a long time. They do not create a later payment reset, and the savings continue month after month. The tradeoff is that points consume cash at closing. That same cash might otherwise support reserves, repairs, moving costs, or a stronger emergency fund. In other words, points can look mathematically attractive and still be the wrong choice if they leave the borrower short on liquidity.
Lender credits deserve equal attention because they solve a different problem. A credit can reduce the cash needed to close, which may be more valuable than a lower payment for some households. If the choice is between draining savings to pay points or accepting a slightly higher rate with a credit, the higher-rate option may be safer even if it costs more over time. This calculator does not decide your priorities for you, but it does make the tradeoff easier to see and discuss.
Use the CSV export if you want a simple record of the scenario you tested. That can help when comparing multiple lender quotes, discussing concessions with an agent, or reviewing options with a spouse or adviser. The exported table is not a full amortization schedule, but it is enough to document the assumptions behind the comparison and keep your decision process organized.