Renting vs Buying Explained: The Break-Even, the Hidden Costs, and the 5% Rule

Renting versus buying is the largest financial comparison most people ever make, and the most slogan-driven. “Renting is throwing money away” ignores the interest, taxes, insurance, maintenance, and opportunity cost that buying also throws away — and “buying is always better” ignores the years in which renting wins. The honest comparison is a break-even: the number of years after which the total cost of owning falls below the total cost of renting, with every cost counted on both sides. This guide covers that break-even, the costs each side hides, and the 5% rule that gives a quick answer before the full comparison.

The break-even: the only number that decides

Break-even is the year in which the cumulative cost of owning, including the equity built, falls below the cumulative cost of renting, including the investment growth on the money not spent on a deposit. In the early years, owning loses: the closing costs, the interest-heavy mortgage payments, and the maintenance all land before the equity has had time to build. Over time the balance tips, because the mortgage payment is partly principal — forced saving — while rent is entirely consumption, and because the home’s value may rise while the rent rises too. The year the curves cross is the break-even, and the decision is whether you will stay past it.

The expected stay is therefore the first input, not the last. A buyer who will move in 3 years is buying into the losing side of the curve in most markets: the closing costs on buying and selling, the early interest, and the lack of equity make the short stay expensive, and renting wins. A buyer who will stay 15 years is usually on the winning side, because the equity and the fixed payment have had time to work. The comparison is not “renting versus buying” in the abstract; it is “renting versus buying for the years I will actually be there.” The Rent vs Buy Calculator plots both curves year by year, so the crossing is visible rather than asserted.

Two sensitivities move the break-even more than any others: home price growth and rent growth. Faster home growth pulls the break-even earlier; faster rent growth does too, because the alternative gets more expensive. A comparison that assumes 0% home growth and 3% rent growth is a different comparison from one that assumes 3% and 3%, and the honest approach is to run both, and to treat the break-even as a range, not a date. The range is the answer; a single year is a guess dressed as a fact.

The costs each side hides

Owning hides five costs behind the mortgage payment. Property tax, which rises with assessments and never ends. Homeowner’s insurance, which rises with rebuilding costs. Maintenance and repairs, commonly planned at 1% of the home’s value per year — $3,000 a year on a $300,000 home — with a roof or a furnace arriving as a lump on top. Homeowner association dues where they apply. And the opportunity cost of the deposit: a $60,000 deposit invested at 7% would earn $4,200 a year, and that forgone return is a cost of owning, however invisible. The mortgage payment is the largest single cost of owning and it is not the whole cost; the rest is a third to a half again.

Renting hides two. Rent rises, typically with inflation or faster in tight markets, while a fixed-rate mortgage payment does not — the renter’s cost grows every year, the owner’s does not, and the gap compounds. And the renter builds no equity and gains nothing from home price growth, which is the owner’s return on the same years. What renting does not hide is flexibility: the ability to move for a job, to downsize, or to leave a bad neighbourhood without selling costs. Flexibility has a value, and it belongs in the comparison as a quality, even though it has no number.

Tax treatment belongs in the comparison where it applies, and it has changed. Mortgage interest and property tax were historically deductible for many owners; the standard deduction’s size now means many owners take no itemised benefit from them. The calculator’s tax inputs should reflect the actual tax position, not the assumed one. A buyer who assumes a deduction that the standard deduction has already absorbed overstates the case for buying by the full amount of the phantom saving.

The 5% rule, and the decision

The 5% rule is a quick check from the unrecoverable-cost method. Add the costs of owning that are never recovered — property tax (about 1%), maintenance (about 1%), and the cost of the capital tied up in the home (the mortgage rate or the investment return, about 3%) — to get roughly 5% of the home’s value a year. If the annual rent for an equivalent home is less than 5% of the home’s value, renting is usually cheaper; if it is more, buying is usually cheaper. A $300,000 home at 5% costs $15,000 a year unrecoverable; rent of $1,200 a month ($14,400 a year) is below it, so renting wins the quick check; rent of $1,500 a month ($18,000) is above it, so buying wins.

The rule is a check, not a verdict. It assumes the 1% + 1% + 3% split, which varies by market: property tax is higher in some states and near zero in others, maintenance varies with the home’s age, and the cost of capital varies with rates. It ignores home price growth, which favours buying, and it ignores the value of flexibility, which favours renting. Use it to decide whether the full comparison is worth running — if the rule says renting wins by a wide margin and the stay is short, the full comparison will rarely reverse it — and run the full comparison for the decision itself.

Decision checklist. The expected stay exceeds the break-even, with margin for the growth assumptions. The monthly cost of owning, including tax, insurance, and maintenance, fits the budget without strain. The deposit leaves an emergency fund intact — the whole deposit is not the whole of the savings. And the non-financial reasons — stability, control over the home, the ability to move — point the same way as the numbers, or are consciously set against them. A decision that passes the numbers and fails the life is not a good decision; a decision that passes the life and fails the numbers is a cost accepted knowingly, which is different from a cost discovered later.

Worked table: the 5% rule at three prices and three rents

The 5% rule turns into a table by multiplying. At each home price, the unrecoverable annual cost is 5% of the price; at each rent, the annual rent is the monthly rent times 12. Where the annual rent is below the 5% figure, renting wins the quick check; where it is above, buying wins. The table below shows the comparison at three prices and three rents, and the pattern is the point: the verdict depends on the pairing, not on either figure alone — a $300,000 home is a buy against $1,500 rent and a rent against $1,000, and neither the home nor the rent is “better” in the abstract.

The middle row is the marginal case. At $300,000, the 5% cost is $15,000 a year, or $1,250 a month. Rent of $1,200 a month ($14,400 a year) is below it, so renting wins by $600 a year on the quick check — a margin small enough that the growth assumptions, the tax position, or the value of flexibility could reverse it. Rent of $1,500 a month ($18,000) is above it by $3,000, and buying wins by a margin that survives most assumption changes. The quick check’s value is in sorting the clear cases from the marginal ones: the clear cases need no further analysis, and the marginal ones deserve the full comparison.

The table assumes the 1% + 1% + 3% split, and the split should be replaced by the local figures where they differ. In a high-tax state, the property-tax slice may be 2% and the rule becomes 6%; in a low-tax state it may be 0.5% and the rule becomes 4.5%. In a market where the cost of capital is 5% rather than 3%, the rule becomes 7%. The table is a template, not a verdict: substitute the local tax rate, the local maintenance experience, and the actual mortgage or investment rate, and the verdict for the specific home follows.

Annual rent in brackets. The 5% rule is a quick check — run the full comparison for the decision.

The value of flexibility: what the numbers cannot price

Flexibility has no line in the break-even, and it has a value that the break-even cannot see. A renter can move for a job in weeks, at the cost of a notice period and a van; an owner moves in months, at the cost of selling fees, the risk of a slow sale, and the chance of selling into a falling market. A renter can downsize when the children leave, upsize when they arrive, and leave a neighbourhood that has changed for the worse. An owner’s flexibility is bought with transaction costs every time it is used, and the costs are large enough — 5–8% of the price to sell, in most markets — that moving twice in five years can consume the equity the ownership built.

Stability is flexibility’s mirror, and it has a value too. An owner cannot be given notice, cannot have the rent raised at renewal, and can alter the home — the kitchen, the garden, the walls — without permission. A renter’s home is conditional on the landlord’s plans, and a landlord’s decision to sell or move in ends a tenancy however long it has run. Families with children in school, people with accessibility needs that require adaptation, and anyone whose work is fixed in one place value stability highly, and they rationally pay for it in the form of the ownership costs the break-even counts against them.

The honest comparison therefore has two columns: the financial column, which the break-even computes, and the life column, which the household supplies. Where the two columns agree, the decision is easy. Where they disagree, the disagreement should be priced consciously: the household that buys despite a break-even of 12 years, because stability matters, is paying for stability with the years before break-even, and should know the price. The household that rents despite a break-even of 4 years, because a move is likely, is being paid for flexibility with the saving, and should know that too. A decision made with both columns visible is a good decision even when it costs money; a decision made with one column hidden is a surprise waiting for its date.

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