Offer Comparison Calculator

How to Compare Two Offers on a Rental Property

An offer comparison calculator helps investors evaluate two different purchase offer structures on the same rental property. Because the property itself does not change between offers, the income and operating expenses stay constant while the financing terms, purchase price, and closing cost allocation shift the financial outcomes in different directions.

This is particularly useful when negotiating seller concessions. A common scenario involves choosing between a lower purchase price where the buyer pays closing costs versus a higher price where the seller covers closing costs. The monthly payment difference may seem small, but the effects on total cash invested, cap rate, cash-on-cash return, and long-term equity can be significant.

Why Purchase Price and Closing Cost Structure Matter

When a seller agrees to pay closing costs, the buyer typically pays a higher purchase price to compensate. This means the buyer finances a larger loan amount, which increases the monthly mortgage payment and reduces cap rate. However, the buyer preserves cash by not paying closing costs out of pocket, which can improve cash-on-cash return if the upfront savings outweigh the slightly lower monthly cash flow.

The tradeoff is not always intuitive. A $5,000 difference in purchase price at 80% LTV means $4,000 more financed and only about $27 more per month on a 30-year loan at 7%. But it also means $5,000 less equity from day one and a permanently lower cap rate on the property. For investors focused on long-term hold and equity building, the lower price usually wins. For investors prioritizing cash preservation for their next deal, seller-paid closing costs may be the better play.

Key Metrics for Comparing Offers

Total Cash In measures how much capital the investor needs to close the deal. This includes the down payment, any buyer-paid closing costs, and repair or rehab costs. Lower Total Cash In means the investor preserves more capital for reserves or additional investments.

Monthly Cash Flow shows the net income after all operating expenses and debt service. This is the number most investors check first, but it should not be the only comparison point. A deal with slightly lower cash flow but significantly lower upfront capital may produce a better return on the cash invested.

Cap Rate divides annual net operating income by the purchase price, measuring the property's return independent of financing. Higher purchase prices always produce lower cap rates for the same property, which is why seller-concession deals (at inflated prices) show lower cap rates even though the buyer paid less cash upfront.

Cash-on-Cash Return divides annual cash flow by total cash invested. This is often the most useful single metric for comparing offers because it accounts for both the income produced and the capital required to produce it. An offer with lower cash flow but much lower cash invested can still deliver a higher cash-on-cash return.

When Seller-Paid Closing Costs Make Sense

Seller-paid closing costs are most advantageous when the investor is capital-constrained. If preserving $4,000 to $6,000 in cash means being able to maintain adequate reserves or close on a second property sooner, the slightly higher purchase price and lower cap rate may be a worthwhile tradeoff.

They also make sense in markets where comparable sales support the higher price. If the appraisal comes in at or above the higher offer price, the buyer is not overpaying relative to the market. The seller concession effectively converts a closing cost into financed debt, spreading the cost over 30 years instead of paying it upfront.

Seller concessions are less attractive for investors focused on equity building, long-term appreciation, or refinancing within a few years. The higher purchase price means starting with less equity, a lower cap rate on paper, and potentially less favorable terms when refinancing since LTV is calculated against the purchase price.

How to Use This Calculator Effectively

Start by entering the shared property details that apply to both offers: rent, vacancy, taxes, insurance, and operating expenses. These stay constant because the property is the same regardless of which offer structure you choose.

Then enter the specific terms for each offer. Change only the fields that differ between the two offers. In most seller-concession comparisons, the purchase price and buyer-paid closing costs are the only fields that change. Keep down payment percentage, interest rate, and loan term the same to isolate the effect of the price and closing cost tradeoff.

Review the Head-to-Head Comparison section at the bottom for a clear summary of which offer wins on each metric. Pay closest attention to the metrics that matter most for your investment strategy: Total Cash In if you are capital-constrained, Cash Flow if you need monthly income, or Cap Rate and Cash-on-Cash if you are evaluating long-term returns.

Frequently Asked Questions

Should I ask the seller to pay closing costs?

It depends on your capital situation. Seller-paid closing costs preserve your cash but typically come at a higher purchase price, which lowers cap rate and starting equity. If preserving cash for reserves or additional investments is a priority, seller concessions can be a smart negotiating tool.

How much do seller concessions affect monthly payment?

On a typical deal, a $5,000 price increase at 80% LTV and 7% interest adds roughly $27 per month to the mortgage payment. The monthly impact is small, but the effects on cap rate, equity, and total cost over 30 years are more significant.

Which metric matters most when comparing offers?

Cash-on-Cash Return is often the most useful single metric because it accounts for both the income produced and the capital required. However, if cash preservation is the priority, focus on Total Cash In. For long-term holds, Cap Rate gives a financing-independent view of property value.

Does a higher purchase price always mean a worse deal?

Not necessarily. A higher price with seller-paid closing costs means less cash out of pocket, which can improve Cash-on-Cash Return despite producing a lower cap rate. The better deal depends on whether you prioritize preserving capital or maximizing long-term equity and returns.

What is the 1% rule in the comparison?

The 1% rule divides monthly rent by the purchase price. A result of 1.0% or higher is a common screening threshold for cash flow potential. Higher purchase prices produce lower 1% rule scores for the same rent, which is one reason seller-concession deals sometimes look weaker on quick screening metrics.

Can I compare offers with different interest rates?

Yes. Enter different rates in each offer column to compare how rate differences affect monthly payment, cash flow, and returns. This is useful when one lender offers a lower rate but higher fees, or when comparing fixed-rate versus adjustable-rate scenarios.