$300,000 Mortgage at 5%
See exactly what you'll pay on a $300,000 home loan at 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% over 30 years: $1,610.46
Monthly
$1,610.46
Fortnightly
$743.29
Weekly
$371.65
Total cost over 30 years
$579,767
Principal $300,000 + Interest $279,767
Total interest paid
$279,767
93% of the loan amount
25-Year vs 30-Year Term
| 25 years | 30 years | Difference | |
|---|---|---|---|
| Monthly repayment | $1,753.77 | $1,610.46 | +$143.31/mo |
| Total interest | $226,131 | $279,767 | Save $53,636 |
| Total repaid | $526,131 | $579,767 | Save $53,636 |
What If Rates Change?
| Rate | Monthly | Fortnightly | vs current |
|---|---|---|---|
| 4.5% | $1,520.06 | $701.56 | -$90.41/mo |
| 5%(current) | $1,610.46 | $743.29 | — |
| 5.5% | $1,703.37 | $786.17 | +$92.90/mo |
| 6% | $1,798.65 | $830.15 | +$188.19/mo |
| 6.5% | $1,896.20 | $875.17 | +$285.74/mo |
Income Needed
You'd need a household income of approximately $64,419/year ($5,368/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 $115,650 in interest
- Pays off your loan 11.1 years sooner
Fortnightly vs Monthly Trick
Paying $805.23 fortnightly (half the monthly repayment) instead of $1,610.46 monthly means you make 26 half-payments per year — equivalent to 13 monthly payments instead of 12.
- Interest saved: $51,492
- Time saved: 4.7 years
Frequently Asked Questions
How much are repayments on a $300,000 mortgage?
At 5% over 30 years, monthly repayments on a $300,000 mortgage are $1,610.46. Fortnightly repayments are $743.29 and weekly repayments are $371.65.
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 $64,419 per year to comfortably afford a $300,000 mortgage at 5%.
How much interest will I pay on $300,000 over 30 years?
At 5%, the total interest on a $300,000 mortgage over 30 years is $279,767. The total amount repaid would be $579,767.
What if interest rates rise above 5%?
If rates rise by 1% to 6%, monthly repayments on a $300,000 mortgage increase to $1,798.65 — an extra $188.19 per month.
Other Mortgage Amounts
Other Interest Rates
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General information and estimates only — not financial, tax, or legal advice. Always verify with a licensed adviser or the ATO.