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ARM vs Fixed Rate Calculator

Compare adjustable-rate and fixed-rate mortgage payments for a condo purchase.

Adjustable-rate mortgages can lower early payments but expose you to rate shocks. Fixed rates trade higher initial cost for predictability, which helps when HOA fees already move.

Model both paths using your expected hold period and rate scenarios.

Last updated: May 2026

Your numbers

What this means

Over 7 years, total P&I differs by $0 between these simplified ARM and fixed paths.

Assumptions and limitations

  • ARM modeled with one rate change after year 5; real ARMs have caps, indexes, and intervals.

Frequently asked questions

When is an ARM worth it?
Some buyers choose ARMs if they plan to sell or refinance before adjustments, especially when fixed rates are high.

When this matters

  • You are offered a lower start rate on an ARM but plan to stay more than a few years
  • HOA already adds payment volatility and you want to limit mortgage uncertainty

What this calculator does not include

  • Live tax bills, insurance quotes, or HOA budgets from any database
  • Lender approval, HOA questionnaire results, or project eligibility
  • Future HOA increases unless you change the inputs yourself
  • Home price appreciation or depreciation
  • Income tax deductions for mortgage interest or property tax
  • Selling costs, agent commissions, or capital gains tax
  • Exact ARM adjustment caps from your loan documents

See our methodology page for how each input is defined and how to interpret results.

Common questions

When does an ARM make sense?
Some buyers choose ARMs if they plan to sell or refinance before adjustments, especially when fixed rates are high. Model your hold period explicitly.

Sources to verify before buying

Use this checklist during due diligence. Calculators help you plan; these documents tell you what a specific building actually costs.

  • HOA budget and most recent financial statements
  • Reserve study and percent-funded summary
  • Master insurance policy declarations and renewal terms
  • Board meeting minutes from the past 12–24 months
  • Pending or approved special assessment notices
  • County or municipal property tax estimator for the unit
  • HO-6 insurance quote matched to master policy coverage
  • Lender condo questionnaire or project approval status

Assumptions and limitations

  • Outputs are planning estimates only, not quotes from lenders, insurers, or tax authorities.
  • Actual HOA dues, insurance premiums, and tax assessments vary by building, location, and ownership status.
  • PMI, special assessments, and reserve risk are modeled with simplified assumptions unless you enter your own figures.
  • Always confirm numbers with association documents, your agent, and qualified professionals before making an offer.

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