Real Estate Tax Calc
How refinancing changes the denominator
Cash-on-cash return is annual pre-tax cash flow divided by total cash invested. When you refinance and pull equity out, the proceeds reduce your net cash invested in the property. If you originally put $80,000 down and later pull $50,000 out through a cash-out refinance, your effective cash invested in this property drops to $30,000.
A smaller denominator means the same cash flow produces a higher cash-on-cash return — mathematically. This is the logic behind the BRRRR strategy (Buy, Rehab, Rent, Refinance, Repeat): if you can refinance out most or all of your original investment while maintaining positive cash flow, your cash-on-cash return on the remaining invested cash rises dramatically.
How refinancing changes the numerator
The problem: a larger mortgage loan usually means higher monthly debt service — higher principal and interest payments that reduce your annual cash flow. The refinanced loan may be at a higher interest rate than your original mortgage, or on a shorter amortization, or both. Cash flow (the numerator) shrinks as debt service rises.
Example: A property generates $12,000/year in cash flow with $1,500/month in debt service. You cash-out refinance at a higher rate, raising debt service to $2,000/month — adding $6,000 in annual payments. Cash flow drops to $6,000. Your cash-on-cash return on the $30,000 remaining invested is 20% ($6,000 ÷ $30,000) — higher than the original 15% ($12,000 ÷ $80,000), but cash flow itself is lower.
Modeling the real tradeoff: where the cash goes
The key question in any cash-out refinance decision is: what do you do with the pulled-out equity? If the proceeds sit in a bank account earning 4% and your rental now earns 20% cash-on-cash, that looks like a win on the property. But the full picture compares the net return on the redeployed capital (new property, other investments) against the marginal cost of borrowing (the refinance rate).
Tax implications also matter: refinance proceeds are not taxable income (a loan is not income), but the higher interest payments are deductible. The original equity you pulled out had accumulated without being taxed — you only defer (not eliminate) recapture on that equity until you eventually sell. Run the cash-on-cash numbers on all deployed capital together, not just the refinanced property in isolation.
A full worked example: before and after the refinance
Start with the original deal. You bought a rental for $320,000 with $80,000 down (25%) plus $8,000 in closing costs, so total cash invested was $88,000. The property nets $12,000 a year in pre-tax cash flow after the original $1,500/month mortgage. Original cash-on-cash return: $12,000 ÷ $88,000 = 13.6%.
Three years later the property appraises at $400,000. You do a cash-out refinance at 70% loan-to-value, borrowing $280,000. After paying off the remaining $228,000 first-mortgage balance and $7,000 in refinance closing costs, you walk away with about $45,000 in tax-free cash. Your effective cash left in the deal falls to roughly $88,000 − $45,000 = $43,000.
But the new $280,000 loan carries a higher payment — say $1,850/month at today's rates versus the old $1,500 — cutting annual cash flow by about $4,200 to $7,800. New cash-on-cash on the remaining $43,000: $7,800 ÷ $43,000 = 18.1%. The percentage rose from 13.6% to 18.1%, yet the dollars of cash flow fell from $12,000 to $7,800. That gap is the entire decision.
The $45,000 you extracted is only a good trade if you can put it to work above your marginal cost of borrowing. Redeploy it into a second property earning 15% cash-on-cash and you have added roughly $6,750 of new annual cash flow — more than replacing the $4,200 you gave up. Leave it in a savings account at 4% and you have manufactured a higher percentage while destroying real cash flow.
Step by step: how to model the decision
1. Nail down the new loan terms. Get the actual rate, amortization, and closing costs in writing, not a rule of thumb. A quarter-point rate difference on a large balance moves annual cash flow by hundreds of dollars.
2. Recompute cash flow at the new payment. Subtract the higher annual debt service from NOI. This is your new numerator.
3. Recompute cash invested. Original cash in, minus net proceeds pulled out. This is your new denominator. Some investors treat a full return of capital as a denominator of zero (an infinite return), which is why cash-on-cash alone becomes misleading after a heavy refinance.
4. Model the redeployed capital separately. Build a mini-proforma for wherever the $45,000 goes. Blend the two returns to see the portfolio-level effect.
5. Stress-test the new payment against vacancy. Higher debt service shrinks your cushion. Confirm the property still cash-flows through a realistic vacancy and repair scenario.
When a cash-out refinance hurts your return
The refinance can quietly turn a healthy property into a break-even one. If the new debt service pushes your debt-service coverage ratio (DSCR) below about 1.2, one bad month of vacancy or a major repair can flip the property to negative cash flow — and now you have less equity buffer to absorb it.
Watch the trap of a higher-percentage, lower-dollar return that looks like progress on a spreadsheet. If you extract capital and it sits idle, your reported cash-on-cash rises while your actual income falls. The metric rewards a smaller denominator even when you are worse off. Always sanity-check the raw dollars of cash flow alongside the percentage.
Rate environment matters enormously. Refinancing a 4% loan into a 7% loan to pull equity means every dollar borrowed costs 7% — the pulled cash must clear that hurdle to be worthwhile. In a rising-rate market, the arithmetic that made a cash-out obvious in a low-rate era can reverse.
Return on equity: the metric a refinance is really about
As a property appreciates and the loan amortizes, your trapped equity grows — and your return on equity (ROE), cash flow divided by current equity, tends to fall even as cash-on-cash on your original basis looks fine. A cash-out refinance is fundamentally a tool to fix a sagging ROE: it moves lazy equity out of a property and back into productive use.
Compute ROE before deciding. If a property with $170,000 of equity throws off $12,000 of cash flow, its ROE is only 7%. Pulling $45,000 out and redeploying it at 15% is a rational reallocation even though the refinanced property's own cash flow drops. The right lens is the whole portfolio, not one property's cash-on-cash in isolation.
Common mistakes and planning tips
Ignoring closing costs in the return math. Refinance costs of $6,000–$8,000 reduce your net proceeds and, on a rental, are amortized over the loan term rather than deducted in year one. Fold them into the true amount of capital you freed up.
Refinancing right before a sale. If you plan to sell within a year or two, a cash-out refinance adds costs you will never fully amortize and can complicate the payoff. A 1031 exchange or an installment sale may serve better.
Over-leveraging into a soft market. Pulling equity to the 70–75% LTV ceiling leaves little room if values dip; you can end up unable to refinance again or sell without bringing cash to closing.
Timing the pull with a rehab. The BRRRR playbook works because a forced-appreciation rehab lets you refinance at a higher value and recover most of your basis. A cash-out on a property you have not improved simply trades interest cost for liquidity — fine if you have a use for the cash, wasteful if you don't.
A note on state taxes and the deduction
The interest on the new, larger loan is deductible against rental income on Schedule E to the extent the borrowed funds are used in the rental activity or otherwise traced to a business or investment use under the interest-tracing rules. If you divert cash-out proceeds to personal spending — a car, a vacation — the interest on that traced portion is not a rental deduction. Keep a clean record of where the money went.
States generally follow the federal treatment of the interest deduction on Schedule E, but a handful decouple from federal rules on specific items, and states without an income tax (such as Texas or Florida) offer no additional deduction because there is no state return to claim it on. The refinance proceeds themselves are never taxable income in any state — a loan is a loan.
Frequently asked questions
Does a cash-out refinance improve cash-on-cash return?
Sometimes. It reduces cash invested (the denominator) but also reduces cash flow through higher debt service (the numerator). The net effect depends on the new loan terms and where you redeploy the cash.
Are cash-out refinance proceeds taxable?
No. Loan proceeds are not income. However, the higher interest payments are deductible as a rental expense, which partially offsets the higher debt service.
How does BRRRR use cash-out refinancing?
BRRRR investors buy, renovate, rent, then refinance to pull most of the original investment back out — ideally leaving little or no original cash invested, making the cash-on-cash return very high on the remaining equity.
If I pull out all my original cash, what is my cash-on-cash return?
Mathematically it approaches infinity, because the denominator (cash invested) approaches zero. At that point cash-on-cash stops being a useful metric — switch to evaluating the raw dollars of cash flow and the return on the capital you redeployed elsewhere.
Should I look at return on equity instead of cash-on-cash after a refinance?
Yes, both. Return on equity (cash flow ÷ current equity) captures the appreciation and amortization a refinance is meant to unlock, while cash-on-cash tracks yield on your out-of-pocket capital. A cash-out refinance typically raises cash-on-cash and resets a sagging return on equity at the same time.
Is the interest on the new larger loan fully deductible?
It is deductible against rental income to the extent the loan is used in the rental activity. If you spend part of the cash-out proceeds on personal items, the interest traced to that portion is not a rental deduction under the interest-tracing rules, so document where the money goes.
Does a cash-out refinance create a taxable event?
No. Borrowing against your equity is not a sale and generates no taxable income, even though the cash may exceed your basis. Tax on that appreciation is only deferred — it comes due (with depreciation recapture) when you eventually sell without a 1031 exchange.
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.