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House Hacking Calculator

Estimate your net housing cost and savings potential by comparing your mortgage payment against rental income from other units on your property.

Quick answer: Estimate signed housing cash flow after entered rental income, expenses, vacancy reserve, and mortgage payment. Enter Total Monthly Mortgage Payment, Rental Income From Other Units, Monthly Rental Expenses and Vacancy Reserve, and Market Rent for a Comparable Unit to personalize the estimate. It returns Signed Net Housing Cost, Monthly Savings vs Renting, and Annual Savings vs Renting so you can compare the impact before choosing a next step. Use it to compare payment, equity, rate, and timing tradeoffs before applying or changing a loan.

SWReviewed by SwitchWize Research Desk · Last reviewed July 20, 2026
Signed Net Housing Cost
$1,000
Signed Net Housing Cost
$1,000
Monthly Savings vs Renting
$800
Annual Savings vs Renting
$9,600
Diagnostic

After rental income from other units, your signed net housing cost is $1,000 a month; negative represents modeled positive cash flow.

The signed savings-versus-renting difference is $800 a month against $1,800 to rent a comparable place.

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What to do next

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Your action plan
  1. 1

    Set the target and timeline for this plan

    Estimate signed housing cash flow after entered rental income, expenses, vacancy reserve, and mortgage payment.

  2. 2

    Pressure-test one alternate scenario before deciding

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

Calculator action path

Turn this result into a decision

Every SwitchWize calculator connects to a product comparison, rate context, guidance, alerts, and Money Map.

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Money Map
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About mortgage rates

Mortgage rates depend on loan type (30-yr fixed, 15-yr fixed, ARM, FHA, VA, jumbo), your credit score, down payment, points paid, loan amount, property state, and whether you're purchasing or refinancing. The calculator above uses a representative market rate for payment estimates, your actual rate will vary.

For a personalized rate comparison, use the tool below to see lenders ranked by APR, loan type, and your profile.

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Mortgage rates shown on SwitchWize compare pages include loan type, assumed FICO, LTV, and points. Representative only. Verify all terms directly with the lender. Advertising disclosure

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Frequently Asked Questions

Everything you need to know.

What does an example House Hacking Calculator calculation look like?
Using this calculator's own default assumptions, a total monthly mortgage payment of $2,800, rental income from other units of $2,200 and monthly rental expenses and vacancy reserve of $400 produces an estimated signed net housing cost of $1,000 and monthly savings vs renting of $800. Enter your own numbers above to see how it changes for your situation.
What counts as a rental expense in this calculator?
Rental expenses include repairs, maintenance, property management fees, insurance, utilities you cover, and any other costs tied to maintaining and managing the rental units. The vacancy reserve is money you set aside to cover months when units sit empty. This protects your cash flow from income gaps.
How does this calculator show if house hacking is worth it?
If your signed net housing cost is negative or low, your rental income is covering most or all of your mortgage and expenses, meaning you're living in your unit nearly free while building equity. The monthly and annual savings compare what you'd pay renting a comparable unit elsewhere against what you're actually paying after rental income, a direct measure of your financial advantage.
Is the House Hacking Calculator free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the House Hacking Calculator affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to compare mortgage lenders, or run Money Map to compare this home & mortgage decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (mortgage) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

House hacking lets you offset your housing expenses by renting out portions of your property, potentially turning your largest monthly cost into an investment that pays for itself. Understanding your signed net housing cost reveals whether rental income covers your mortgage and expenses, or how much you're contributing out-of-pocket. This calculation shows the real financial impact of occupying one unit while generating income from others.

How to Use It

  1. 1Enter your total monthly mortgage payment, including principal, interest, taxes, and insurance.
  2. 2Input the monthly rental income you expect from renting out the other units in your property.
  3. 3Add your monthly rental expenses and vacancy reserve to account for maintenance, management, and income gaps.
  4. 4Provide the market rent for a comparable unit to benchmark your rent-setting against local rates.
  5. 5Review your signed net housing cost, monthly savings versus renting, and annual savings to see your cash flow impact.
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