$300,000 Mortgage at 5.5%
See exactly what you'll pay on a $300,000 home loan at 5.5% interest. Monthly, fortnightly, and weekly repayments with total interest and savings tips.
Last verified: 5 May 2026Monthly repayments on a $300,000 mortgage at 5.5% over 30 years: $1,703.37
Monthly
$1,703.37
Fortnightly
$786.17
Weekly
$393.08
Total cost over 30 years
$613,212
Principal $300,000 + Interest $313,212
Total interest paid
$313,212
104% of the loan amount
25-Year vs 30-Year Term
| 25 years | 30 years | Difference | |
|---|---|---|---|
| Monthly repayment | $1,842.26 | $1,703.37 | +$138.90/mo |
| Total interest | $252,679 | $313,212 | Save $60,533 |
| Total repaid | $552,679 | $613,212 | Save $60,533 |
What If Rates Change?
| Rate | Monthly | Fortnightly | vs current |
|---|---|---|---|
| 5% | $1,610.46 | $743.29 | -$92.90/mo |
| 5.5%(current) | $1,703.37 | $786.17 | — |
| 6% | $1,798.65 | $830.15 | +$95.28/mo |
| 6.5% | $1,896.20 | $875.17 | +$192.84/mo |
| 7% | $1,995.91 | $921.19 | +$292.54/mo |
Income Needed
You'd need a household income of approximately $68,135/year ($5,678/month) to comfortably afford this mortgage using the 30% rule — where no more than 30% of your gross income goes toward housing costs.
Extra Repayment Impact
Paying an extra $100/week on your $300,000 mortgage:
- Saves $132,100 in interest
- Pays off your loan 11.2 years sooner
Fortnightly vs Monthly Trick
Paying $851.68 fortnightly (half the monthly repayment) instead of $1,703.37 monthly means you make 26 half-payments per year — equivalent to 13 monthly payments instead of 12.
- Interest saved: $62,255
- Time saved: 5.1 years
Frequently Asked Questions
How much are repayments on a $300,000 mortgage?
At 5.5% over 30 years, monthly repayments on a $300,000 mortgage are $1,703.37. Fortnightly repayments are $786.17 and weekly repayments are $393.08.
What income do I need for a $300,000 mortgage?
Using the 30% rule (no more than 30% of gross income on housing), you would need a household income of approximately $68,135 per year to comfortably afford a $300,000 mortgage at 5.5%.
How much interest will I pay on $300,000 over 30 years?
At 5.5%, the total interest on a $300,000 mortgage over 30 years is $313,212. The total amount repaid would be $613,212.
What if interest rates rise above 5.5%?
If rates rise by 1% to 6.5%, monthly repayments on a $300,000 mortgage increase to $1,896.20 — an extra $192.84 per month.
Other Mortgage Amounts
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General information and estimates only — not financial, tax, or legal advice. Always verify with a licensed adviser or the ATO.