Slicing Up Your Budget: A Pie-Chart Plan for Pi Day - 1st Source

Pi Day is the perfect excuse to make math jokes about dessert. On 3/14, we’re not debating if pie is basically a fruit sandwich (it is). This year, 1st Source Bank is doing the most Pi Day thing possible:

Turning your money into pie charts.

Pi goes on forever. Your paycheck… does not. So let’s slice it wisely.

Imagine your monthly take-home pay is a fresh-baked pie cooling on the counter. You slice pieces off that pie: housing takes a slice, groceries take a slice, gas takes a slice… and by the time you’re looking for “savings,” you’re holding the spatula like, “Wait—who took an extra piece?”

Before you start hacking away at the pie with a butter knife, we’re going to help you plan your slices so the basics get covered, you still get to enjoy life, and a leftover piece gets sets aside for Future You.

Step 1: Bake your first pie chart (in 10 minutes)

No fancy tools required. Just:

  • Your last 30 days of transactions (online banking, statement, or app)
  • Notes app or paper
  • Optional: calculator (or a teenager who likes pressing buttons)

Recipe:

  1. Add up your total spending for the month.
  2. Sort spending into categories.
  3. Turn each category into a percent:
    Category total ÷ Total spending = slice size

That’s it. This isn’t a soufflé. We’re making pie, not solving a riddle from a math textbook.

Shortcut: If you’re short on time, make a mini-pie first: start with Dining Out + Shopping + “Pantry Extras” (more on that in a second). Those are common places money sneaks away in crumbs and food waste.

Step 2: Pick your pie pans (categories)

Categories are just containers. If your money is going to leave the house, it might as well leave a forwarding address.

Here are simple, common slices:

  • Housing
  • Groceries
  • Transportation
  • Utilities & bills
  • Dining out / coffee (the “À La Mode” slice)
  • Shopping
  • Fun & entertainment
  • Debt payments
  • Future You (savings + investing + extra debt payoff)
  • Pantry Extras (the stuff hiding in the back of the pantry—subscriptions, trials, add-ons)
  • Crumbs (misc. small spending that doesn’t fit elsewhere)

You can name these however you want. If “Kids Stuff” is “Bottomless Pie Tin,” that’s between you and your grocery receipt.

Step 3: Start with the big 3-slice pie chart

Before you zoom in, zoom out. Your paycheck pie can be divided into three big slices:

Needs (the crust)

The basics that keep life running:
housing, utilities, groceries, gas, insurance, minimum debt payments

Wants (the filling)

Convenience and fun:
eating out, entertainment, hobbies, extras

Future You (the slice you wrap up for later)

Savings + investing + extra debt payoff

Now choose a “recipe” that fits your household right now:

Pie Chart #1: The Starting Slice
Needs 65% / Wants 20% / Future You 15%
Great when the essentials are heavy but you still want progress.

Pie Chart #2: The Steady & Balanced Slice
Needs 55% / Wants 25% / Future You 20%
A solid target when bills are manageable.

Pie Chart #3: The Level-Up Slice
Needs 50% / Wants 20% / Future You 30%
For bigger goals: stronger savings, faster debt payoff, down payment momentum.

Real talk: If your Needs slice is bigger than you want, you’re not failing. Sometimes the crust is thick. The goal is a pie that doesn’t fall apart when life bumps the counter.

Step 4: Split the “Future You” slice (saving vs investing)

Once you’ve decided how big “Future You” should be, cut that slice into two wedges:

Saving (keeps the kitchen from catching fire)

Saving is for near-term needs and surprise expenses:

  • starter emergency fund
  • sinking funds (holidays, tires, back-to-school, annual bills)
  • short-term goals

Investing (helps your pie grow over time)

Investing is for long-term goals:

  • retirement accounts (401(k), IRA)
  • long-horizon goals (10+ years)

An easy split:

  • Building stability: 80% saving / 20% investing
  • Emergency fund is solid: 50/50 (or lean more toward investing for long-term goals)

And if you have an employer match? That’s basically free whipped cream.

An Example

Take-home pay: $3,800/month
Goal: wrap up $400/month for Future You
Spending pie = $3,400/month

Example “Spending Pie” ($3,400 total):

  • Housing: $1,200 (35%)
  • Groceries: $520 (15%)
  • Transportation: $450 (13%)
  • Utilities & bills: $300 (9%)
  • Debt payments: $340 (10%)
  • Dining out / coffee (À La Mode): $170 (5%)
  • Pantry Extras: $120 (4%)
  • Shopping: $220 (6%)
  • Fun & entertainment: $80 (2%)

Pie charts make it obvious where the weight is, and where a tiny trim can make room for savings.

The Back-of-the-Pantry Check

Here’s where we bring in the pantry metaphor—because it’s shockingly accurate.

Think of your budget like baking. Some ingredients are true staples like sugar, yeast, flour: you use them constantly. In money terms, those are your real essentials: housing, utilities, groceries, transportation.

But then there are the back-of-the-pantry spices: the cloves or nutmeg you bought for one recipe, shoved behind the flour, and forgot about… until you buy it again.

That’s how a lot of sneaky spending works.

Pantry Extras are the things you might not need every month but they hang around anyway:

  • subscriptions you barely use
  • free trials that quietly became paid
  • app memberships
  • add-ons and upgrades
  • warranties or protection plans you forgot you’re paying for

The goal isn’t to throw out the flour. It’s to stop buying another tin of cream of tartar.

Do a 10-minute Pantry Audit

Ask:

  1. What am I paying for that I didn’t actively choose this month?
  2. What have I paid for but haven’t used in 30 days?
  3. What started as a free trial?
  4. What am I paying for twice (two similar services, overlapping memberships)?
  5. If it “expired” today, would I replace it tomorrow?

If the answer is “no,” it might not deserve shelf space or a slice of your pie.

The Pi Day Slice Challenge

Ready for the easiest math you’ll do all year? The Pi Day Slice Challenge is simple: pick one slice of your money pie to tweak for the next 14 days. This is home-cook easy, not Great British Bake Off  “the clock is ticking and Paul is judging you” stressful. No fancy equipment, no rare ingredients, and definitely no “proof overnight.” Just one small, doable tweak that takes your budget recipe to the next level.

Pick one:

  • Save $3.14/day for 14 days (≈ $43.96)
  • Move $31.40 once into savings today
  • Cancel one Pantry Extra you don’t use
  • Do a 10-minute Pantry Audit and cut one “nutmeg” expense
  • Cook at home 3 extra meals and move the difference to Future You

No need to be a star baker: just add these recipe cards to your budget’s cookbook and enjoy the reults.

Final thought: Portioning isn’t punishment

Budgeting isn’t about skipping dessert. It’s about making sure your pie matches your priorities: bills paid, life enjoyed, and a slice saved for later.

This Pi Day, aim for a pie chart you’ll actually use. Keep the staples. Sweep the crumbs. And most importantly: stop buying nutmeg twice.