Track Fixed Expenses with a Calendar (not a progress bar)

By James Kerr on

Most budget apps make a fundamental mistake: they treat every expense the same way. You get a list of categories, each with a progress bar showing how much you've spent and how much is left. It works fine for groceries, but makes little sense for rent.

That's because there are two fundamentally different types of expenses: fixed and discretionary.

What Are Fixed Expenses?

Fixed expenses are the predictable, scheduled, known costs that you've committed to paying for at some point in the past.

  • Rent or mortgage
  • Car payment
  • Insurance premiums
  • Subscriptions (streaming, software, gym)
  • Loan payments
  • Internet and phone bills

These aren't decisions you make each month. They're commitments. The amount is known, the due date is known, and unless cancelled, you are on the hook to pay for them.

What Are Discretionary Expenses?

Discretionary expenses are everything else. This is the spending you actually control on a day-to-day basis:

  • Groceries
  • Dining out
  • Entertainment
  • Shopping
  • Gas
  • Personal care

How much you spend on discretionary expenses varies week to week based on choices you're actively making.

Why the Distinction Matters for Budgeting

Here's the problem: most budget apps give you the same interface for both types. A progress bar for rent. A progress bar for groceries. A progress bar for your car payment. Same treatment across the board.

A progress bar communicates "You've spent X out of Y so far this month." That's useful information for groceries, clothes or dining out so you can pace yourself, pull back, or buy big depending on how much is left.

But for rent? You'll never spend 20% of your rent category at any point in time. You pay it once, in full, on the date its due. A progress bar is not appropriate for payments like this.

Instead, what you need to know about fixed expenses is much simpler:

  1. Did it get paid?
  2. Was it the expected amount?

A checkbox would be a better way to communicate that it was paid or not along with an alert when the amount doesn't match expectations.

Fixed Expenses Should Be Scheduled, Not Tracked

Because fixed expenses are predictable, they can be scheduled in advance. You know your rent is due on the 1st, your car payment hits on the 15th, and your insurance renews on the 22nd. This means you can lay out your fixed expenses on a calendar and see exactly how much of your income is already spoken for before you spend a single discretionary dollar.

Scheduling lets you answer the question that actually matters: how much is left for everything else?

A Better Way to Think About Your Budget

Once you separate fixed from discretionary, budgeting gets simpler:

For fixed expenses: Schedule them. Confirm they were paid. Flag anything unexpected.

For discretionary expenses: This is where your actual budget lives. Take your income, subtract your fixed expenses, and what's left is what you have to work with. Now a progress bar makes sense.

Try It Yourself

If this resonates, Tend Cash publishes a free tool that helps you keep a clean list of your fixed expenses with a calendar view and simple calculations for totals and averages. It's a good starting point for seeing how much of your income is already committed before the month begins.