Expenses are what you spend each month. Tracking them helps JettWorth project your future savings rate and net worth growth.
How expenses work in JettWorth
Expenses represent your actual monthly spending — the money that goes out of your accounts after tax. This includes rent or mortgage payments, groceries, transport, subscriptions, and everything else.
Unlike income (entered as gross/before tax), expenses are entered as actual spending amounts (post-tax outflows).
Adding expenses
- Go to Expenses in the sidebar.
- Click + Add Expense or edit your existing categories.
- Enter a monthly amount for each category.
- Click Save.
Expense categories
JettWorth groups expenses into categories so you can see where your money goes:
- Housing (rent, mortgage repayments, rates, maintenance)
- Food and groceries
- Transport (car costs, public transport, fuel)
- Utilities (electricity, gas, water, internet, phone)
- Insurance
- Health
- Entertainment and dining out
- Clothing
- Education
- Other
You can also enter a single total monthly expense if you'd rather not break it down.
How expenses affect projections
Your total monthly expenses are a key input to the projection engine. They determine:
- Your savings rate (income after tax minus expenses)
- How fast your investments grow (more savings = more invested = faster growth)
- When you reach FI milestones (lower expenses = earlier FI)
- How much you need in retirement
Expenses are inflated each year in projections by the inflation assumption (default 2.5%).
Tip: If you're not sure of your exact spending, average the last three months of bank statements. A rough number is better than no number.