$300,000 Mortgage at 8%
See exactly what you'll pay on a $300,000 home loan at 8% interest. Monthly, fortnightly, and weekly repayments with total interest and savings tips.
Last verified: 5 May 2026Monthly repayments on a $300,000 mortgage at 8% over 30 years: $2,201.29
Monthly
$2,201.29
Fortnightly
$1,015.98
Weekly
$507.99
Total cost over 30 years
$792,466
Principal $300,000 + Interest $492,466
Total interest paid
$492,466
164% of the loan amount
25-Year vs 30-Year Term
| 25 years | 30 years | Difference | |
|---|---|---|---|
| Monthly repayment | $2,315.45 | $2,201.29 | +$114.15/mo |
| Total interest | $394,635 | $492,466 | Save $97,831 |
| Total repaid | $694,635 | $792,466 | Save $97,831 |
What If Rates Change?
| Rate | Monthly | Fortnightly | vs current |
|---|---|---|---|
| 7.5% | $2,097.64 | $968.14 | -$103.65/mo |
| 8%(current) | $2,201.29 | $1,015.98 | — |
| 8.5% | $2,306.74 | $1,064.65 | +$105.45/mo |
| 9% | $2,413.87 | $1,114.09 | +$212.57/mo |
| 9.5% | $2,522.56 | $1,164.26 | +$321.27/mo |
Income Needed
You'd need a household income of approximately $88,052/year ($7,338/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 $229,490 in interest
- Pays off your loan 12.2 years sooner
Fortnightly vs Monthly Trick
Paying $1,100.65 fortnightly (half the monthly repayment) instead of $2,201.29 monthly means you make 26 half-payments per year — equivalent to 13 monthly payments instead of 12.
- Interest saved: $138,895
- Time saved: 7.2 years
Frequently Asked Questions
How much are repayments on a $300,000 mortgage?
At 8% over 30 years, monthly repayments on a $300,000 mortgage are $2,201.29. Fortnightly repayments are $1,015.98 and weekly repayments are $507.99.
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 $88,052 per year to comfortably afford a $300,000 mortgage at 8%.
How much interest will I pay on $300,000 over 30 years?
At 8%, the total interest on a $300,000 mortgage over 30 years is $492,466. The total amount repaid would be $792,466.
What if interest rates rise above 8%?
If rates rise by 1% to 9%, monthly repayments on a $300,000 mortgage increase to $2,413.87 — an extra $212.57 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.