White two-story house behind a wooden picket fence

How much can I afford?

LearningHow much can I afford?

Affordability is not just the list price. It is whether rent can cover the property’s monthly expenses—mortgage, taxes, insurance, maintenance, management, vacancy, and the rest—while leaving cash flow you can live with, and whether you have enough savings for the down payment and closing stack.

A cheaper house with high monthly expenses can cost you more each month than a stronger deal at a higher purchase price. Think in terms of the offer that still works: monthly costs covered (or acceptably short), enough debt coverage for lending, and how much of your savings you are willing to put in.

Offer price vs monthly cash flowSame rent and monthly expenses — only the purchase price (and loan) change.
  1. Offer $280,000+$420/mo
    Comfortable under these assumptions
  2. Offer $300,000+$280/mo
    Comfortable under these assumptions
  3. Offer $320,000+$110/mo
    Thin cushion — stress rent and expenses
  4. Offer $340,000−$40/mo
    Cash flow turns negative at this price
Break-even offer (sample)About $330,000Above this, monthly cash flow goes negative in this example.

*Taxes, insurance, vacancy, and other operating costs held flat in this sample; the mortgage payment rises with price. Your break-even moves with down payment, rate, rent, and monthly expenses—use price sensitivity in RentStack to find yours.

What to model

Start with the full monthly expense stack, not price alone. Set a down payment and loan terms you can live with, estimate rent from comps, then add taxes, insurance, vacancy, maintenance, and other operating costs. Recalculate as you change the offer price so you can see when monthly cash flow turns negative.

In RentStack, use price sensitivity and break-even offer price to see how far you can push before the deal stops covering monthly expenses. Try a sample report on the Demo page, or model your own listing in the Rental Tool.

Key considerations

Purchase price is only one lever. These factors also decide what you can truly afford:

  • Monthly expenses — mortgage (P&I and PMI when it applies), taxes, insurance, maintenance, management, utilities you pay, and vacancy all hit every month; if rent cannot cover them, the price is not affordable under your assumptions.
  • Down payment percent from savings — a larger down payment lowers the loan and monthly debt service, but ties up more cash and reduces reserves for repairs, vacancy, or the next deal.
  • Closing costs, points, and rehab — cash at closing is more than the down payment; underestimating upfront cash makes an “affordable” offer feel expensive in practice.
  • Interest rate and loan term — small rate moves change the monthly payment and can erase cash flow even when rent looks fine.
  • Reserves after closing — many investors keep months of expenses (and a repair cushion) in savings; if the deal empties that buffer, it may be more than you can afford.
  • Your personal cash-flow floor — some buyers need the property to cover monthly expenses at break-even; others need a minimum monthly surplus before the purchase fits their plan.

FAQ

What monthly expenses should I include?
Include the full carrying cost you expect each month: mortgage principal and interest (and PMI if needed), property taxes, insurance, maintenance or capex allowance, property management, utilities you pay as landlord, and a vacancy assumption. Leaving items out makes the deal look more affordable than it is.
Does a bigger down payment always mean I can afford more?
It can raise the purchase price you can support with positive cash flow, because the monthly mortgage is smaller. It also uses more savings and can leave you less liquid. Affordability is both covering monthly expenses and what percent of your cash you are willing to put in.
What percent of savings should I put toward the deal?
There is no single right number. Many investors keep a reserve for vacancy, maintenance, and unexpected costs rather than deploying every dollar into the down payment. Model the deal at a few down-payment levels and see how cash flow, cash-on-cash, and leftover savings change.
Is break-even offer price the same as what I can afford?
Break-even is where estimated monthly cash flow is about zero—rent roughly covers monthly expenses under your assumptions. You might still want a cushion above zero, or a lender DSCR target, before calling a price affordable. Treat break-even as a ceiling to stress-test—not an automatic target bid.
Why can a cheaper house still be unaffordable?
High monthly expenses—weak rent relative to taxes, insurance, repairs, or financing—can make a lower list price lose money each month. Affordability follows income versus monthly expenses and cash required at closing, not price alone.