3/1 ARM Calculator
Calculate your 3/1 Adjustable Rate Mortgage payments. Compare fixed period vs adjusted payments and see potential savings or costs.
Understanding 3/1 ARM Mortgages
A 3/1 ARM (Adjustable-Rate Mortgage) offers a fixed interest rate for the first 3 years, after which the rate adjusts annually based on market conditions. This can result in lower initial payments compared to fixed-rate mortgages.
How 3/1 ARM Works
- Years 1-3: Fixed interest rate (initial rate)
- Year 4+: Rate adjusts annually based on index + margin
- Rate caps protect against extreme increases
- Payment changes reflect new interest rate
Understanding Rate Caps
- Initial Cap: Maximum rate increase at first adjustment
- Periodic Cap: Maximum annual rate change
- Lifetime Cap: Maximum total increase over loan life
- Common structure: 2/2/5 (initial/periodic/lifetime)
When to Consider 3/1 ARM
- Planning to sell or refinance within 3-5 years
- Expecting income increase before adjustment
- Want lower initial monthly payments
- Believe rates will decrease in the future
Risks to Consider
- Payments may increase significantly after year 3
- Market conditions affect future rates
- Harder to budget for long-term
- May pay more total interest over loan life
3/1 ARM vs Fixed-Rate Mortgage
| Feature | 3/1 ARM | 30-Year Fixed |
|---|---|---|
| Initial Rate | Usually lower | Usually higher |
| Rate Stability | 3 years fixed, then variable | Fixed for entire term |
| Payment Predictability | Unpredictable after year 3 | Fully predictable |
| Best For | Short-term ownership | Long-term ownership |