What is good cash flow for a property?

There is no universal target. Cash flow is good when monthly commitments remain affordable and figures are conservative, with realistic management, maintenance and vacancy allowances and an unexpected-cost buffer. Whether slightly positive or negative depends heavily on financing and repayment and says little on its own about investment quality.

Is negative cash flow bad?

Not automatically. High principal repayment often creates negative cash flow: money leaves monthly, but debt falls and wealth builds faster. It becomes critical if the shortfall cannot be funded sustainably from income, or reserves for rental default, rate changes and unexpected costs are missing. Lasting affordability matters, not the sign alone.

Do principal repayments count in cash flow?

Yes. Repayment is part of debt service and reduces cash flow as a monthly outflow. Economically it is not lost money: each instalment lowers debt and builds assets. For tax, only loan interest is deductible, not principal; check the current details with your tax adviser.

How can I improve cash flow?

The main levers are interest and repayment rates, equity, rent relative to the market and ongoing costs. Tax effects from depreciation (AfA) and deductible expenses can also improve after-tax results. Lower repayment eases cash flow but slows wealth accumulation; every adjustment should fit your overall strategy.

Property cash flow: calculation & meaning • Loro

By Loro Real Estate team · Last updated: July 2026

Yield metrics tell you how well your capital performs. But another figure decides whether rented property is manageable day to day: cash flow. It shows what remains each month after all payments, or what must be added. This guide explains the calculation, why a negative sign is not automatically bad and which factors you can adjust.

First, cash flow too is an illustrative calculation using today's rents, costs and interest. These can change. A credible calculation is conservative and openly identifies rental default and interest risks. For its place within the overall strategy, see Investing in property.

What cash flow is, and how it differs from yield

A rented property's cash flow is its monthly liquidity balance: all receipts less all payments actually passing through your account.

Cash flow formula:

Cash flow = rental income − non-recoverable costs − debt service (interest + principal repayment)

Rental income means rent excluding service charges. Non-recoverable costs mainly include management, maintenance reserves and the non-recoverable share of building charges. Debt service is your monthly bank instalment, interest and principal together.

Unlike gross or net rental yield, which measures return on capital, cash flow measures liquidity. A property can yield well and still require money monthly, for example because of high principal repayments. They answer different questions and cannot replace each other.

We also distinguish pre-tax and after-tax cash flow. After tax, your personal rate and deductible expenses such as interest and depreciation enter the calculation. As these differ greatly by person, the example below is before tax.

Worked example: a rented apartment's cash flow

A deliberately realistic example for an apartment financed mostly through borrowing:

Rent excluding service charges: €1,000 a month
Non-recoverable costs (management, maintenance reserves, etc.): €150 a month
Debt service — assumption: €950 a month (interest + principal; the actual figure depends on loan amount, interest and repayment rate)

Cash flow = 1,000 − 150 − 950 = −€100 a month

Debt service here is illustrative; your actual financing offer determines your calculation. The slightly negative result is not unusual: in high-demand locations, substantial borrowing and sound repayment often require a monthly contribution of this order.

Negative cash flow is not automatically bad

The example's €100 is not lost. Much debt service is principal repayment: every instalment reduces debt and builds wealth. High repayments move today's liquidity into tomorrow's equity. Negative cash flow can therefore be a deliberate strategy.

The decisive factor is affordability, not the sign: does the monthly burden remain manageable even if rent stops or interest rises after the fixed period?

Negative cash flow becomes risky without a buffer. Rental default, interest changes or unexpected special assessments then hit your household budget directly. Without reserves, you may be forced to sell at a bad time, and property has limited short-term liquidity. Always plan a cash reserve.

The main factors affecting cash flow

Cash flow is not fixed; it results from several decisions:

Interest and repayment. Debt service is usually the largest item. Compare terms and choose the fixed period deliberately. Lower repayment eases cash flow but slows wealth-building.
Equity contribution. More equity means a smaller loan and lower debt service. It also changes your capital's return; see our guide to return on equity and leverage.
Rent relative to the market. If current rent is below local levels, there may be legally permitted potential. Calculate conservatively and do not assume automatic increases.
Ongoing costs. Review management, reserves and non-recoverable costs regularly; small amounts add up over the holding period.
Tax effects. Depreciation (AfA) and deductible rental expenses reduce taxable rental profit and can improve after-tax cash flow. For details, see our guide to Property depreciation (AfA) — check your specific current position with your tax adviser.

Cash flow and yield: why check both?

Cash flow and yield belong together but do not replace one another. Yield shows how efficiently the property earns on capital; cash flow shows whether you can keep funding it. Positive cash flow in a poor location or building can disappoint over time. A sound yield with slightly negative cash flow can suit you if you can afford the contribution. Always check both; our guide explains correct gross and net yield calculations: Calculate rental yield. For vetted properties with both figures shown transparently, see our page Buy an income property.

Try the calculator: your figures, not examples

Theory helps; your own figures help more. With our interactive property investment calculator enter price, rent, costs and financing to see how interest, repayment and equity affect cash flow and yield. Adjust factors individually and see when results turn, building an understanding of your project's room for manoeuvre.

If you would like help interpreting the results afterwards, a non-binding initial consultation lets us assess together whether commitments remain suitable for you, with conservative calculations, open risks and no buyer's commission.

This article is for information only and does not constitute investment, tax or legal advice.

Locations

Property cash flow: what remains and why it matters