The Minimum Viable Money System

The minimum viable money system has three parts. Not twelve budget categories. Not five bank accounts. Not a spreadsheet you update twice then abandon—I've started and abandoned so many of those.

Three things. If you do these, you'll know where you stand financially. Everything else is optional optimization.

Part 1: Know your number

You need to know one number: how much you can spend today without compromising tomorrow.

I call this your daily spending limit. The formula is straightforward:

(What you have) - (What you owe) ÷ (Days until more arrives)

No categories. No percentages. Just: here's your balance, here's what's committed, here's how long it needs to last.

If you know this number, you can make any spending decision instantly. $40 dinner? Is $40 less than your daily limit? Yes? Then it's fine.

This single number replaces hours of budget tracking. I'm still kind of amazed it took me so long to figure this out.

Part 2: Know what's committed

Your bills exist whether you track them or not. Subscriptions renew. Rent comes due. Auto-pays execute.

You need a list of these—not to agonize over, just to subtract from your balance accurately.

The minimum version: - Rent/mortgage - Utilities - Insurance - Debt minimums - Subscriptions

Write them down once. Update when things change.

Your bills know things you don't. This list ensures you know them too.

Part 3: Check in regularly

Numbers change. Money comes in, money goes out, situations shift.

A weekly check-in takes five minutes: 1. Check balance 2. Note upcoming bills 3. Recalculate daily limit 4. Decide if anything needs attention

Most weeks, the answer is "nope, we're fine." Some weeks, you'll catch something before it becomes a problem.

That's really the whole system. Know your number. Know your commitments. Check in weekly.

What this replaces

Traditional personal finance says you need:

Detailed budgets with categories for groceries, entertainment, transportation, personal care, gifts, subscriptions, dining out, coffee, household items...

Multiple accounts for bills, spending, emergency fund, vacation fund, car fund, Christmas fund...

Constant tracking where every purchase gets logged, categorized, and compared against allocations...

Monthly reviews analyzing where money went, which categories were over, what to cut...

The minimum viable system replaces all of this with: - One number - One list - One weekly check

This is why budgeting fails for most people, I think. Not because they're bad at it—because it requires unsustainable effort.

Why simpler works better

Complex systems require motivation. When motivation fades—and it always does—the system fails.

Simple systems require less motivation. You do them even when tired, busy, or discouraged.

A five-minute weekly check-in happens. A two-hour monthly budget review doesn't.

The "but what about..." questions

"But how do I save for goals?"

Set up automatic transfers. Before your check-in, that money is already gone. Your daily spending limit reflects what's actually available.

No goal tracking. No category for "vacation fund." Just automated money movement.

"But how do I know where my money goes?"

You know what you can spend. If you spend it, it went to whatever you bought. If you want more detail, look at your bank statement once in a while.

You don't need real-time category tracking. Quarterly awareness is probably fine for most people.

"But how do I cut spending?"

If your daily limit is too low, you have two options: earn more or commit less. Knowing your number makes this obvious.

Canceling a subscription instantly raises your daily limit. The feedback is immediate and clear.

"But what about emergencies?"

Have some money set aside. Start with $500, build to more. This isn't a complicated system within a system—just a separate savings account you don't touch unless you actually need to.

The graduation path

Start with the minimum: - Calculate your daily limit once - Write down your committed expenses - Check in weekly

As you get comfortable, you might add: - Automatic savings transfers - A small emergency buffer - Quarterly spending review

But you don't need to start with all of that. The minimum version works. Everything else is enhancement.

What "enough" feels like

When you know your number, something shifts.

You stop vaguely worrying about money. You stop wondering if you can afford things. You stop feeling guilty about every purchase.

Instead, you just know. $73 available today. That's enough for what I want. Or it's not, and I'll wait.

That clarity—that's probably what "enough" actually feels like.

Common mistakes

Over-complicating from the start. You don't need five bank accounts before you've tracked one number. Start minimum, add complexity only when needed.

Skipping the weekly check-in. The system only works if you update it. Set a reminder. Make it happen.

Mental math instead of actual math. "I think I'm okay" isn't the same as knowing your number. Do the math.

Forgetting subscriptions. They feel small until you list them. That list is part of the minimum system for a reason.

Tools

You can do this with: - A piece of paper - A notes app - A spreadsheet - CshFlow (which I built for exactly this)

The tool matters less than the habit. Whatever you'll actually use is the right choice.

Start today

Right now, try Part 1:

1. Check your bank balance 2. List expenses due before your next paycheck 3. Subtract 4. Divide by days until payday

You now have your number. That took maybe three minutes.

Sunday, do the check-in. See if your number changed.

That's the system. It's enough.

💚

The best money system is the one you'll actually use. This one's simple enough to use.