Winter Utility Spikes: A Sinking Fund Plan That Works

Michael Chen

Michael Chen writes about personal finance fundamentals. Bay Area-based · finance enthusiast for 15 years.

Visual representation of the voice · not a photographic portrait

Quick answer: Add up last year's utility bills, divide by 12, and set aside that monthly average every month, even in cheap months. The extra you save in mild months covers the spike in winter or summer. If you can't build the fund in time, ask your utility about budget billing or a payment plan before the bill is due, not after.↗ Share on X

The simplest way to handle seasonal utility spikes without draining your savings is to pay yourself an average every month. Add up your last 12 months of utility bills, divide by 12, and move that amount into a separate "utilities" account every payday. In mild months, part of it stays in the account. In January or August, when the bill jumps, the money is already waiting. If you can't build that cushion in time, call your utility *before* the bill is due and ask about budget billing or a payment plan.

Below is a step-by-step plan, a worked example, and what to do if a big bill is already on the table.

Why do utility bills spike in certain months?

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Most homes have one or two expensive seasons:

• Winter, when the furnace, space heaters or heat pump run for hours.
• Summer, when air conditioning runs all day in hot regions.
• Holidays, when more people are home, lights stay on and the oven works overtime.

Water bills can also rise in summer if you water a lawn or garden. Natural gas prices can change during the year, too. The problem isn't that the bill goes up. The problem is that most people budget for a "normal" month, so the expensive month comes out of savings or goes on a credit card.

Step 1: How do I find my real yearly utility cost?

You need actual numbers, not a guess. Most utilities show your bill history online or on your paper statements.

1. Log in to each utility account: electric, gas, water, sewer and trash, plus propane or heating oil if you use them.

2. Write down the last 12 monthly bills for each one.

3. Add them up to get your yearly total.

4. Divide by 12 to get your monthly average.

5. Add a small cushion, around 5% to 10%, because rates and weather change from year to year.

If you moved recently and don't have 12 months of history, ask the utility for the past year's usage at your address. Many will share an average.

Step 2: What does a utility sinking fund look like?

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Here is an example household. The numbers are for illustration only. Use your own bills.

In this example, the yearly total is $2,420. Divided by 12, that's about $202 a month. But the household saved only $190, and it started in April with nothing in the account. The result: the fund ran negative in January.

Two lessons from the table:

• Save the full average plus a cushion, not a rounded-down number. At about $210 a month, this household's fund would have stayed positive all year.
• Start in your cheapest months. If you start saving in spring, the fund grows before the expensive season. If you start in December, you're already behind.

If you're starting late, add a one-time boost from a tax refund, a side job or a paycheck with overtime to seed the account.

Step 3: Where should I keep the money?

Keep the utility fund separate from your everyday checking account, or you'll spend it without noticing. Options:

• A second checking or savings account at your bank, nicknamed "Utilities."
• A high-yield savings account, so the balance earns a little interest while it waits.
• A "bucket" or "goal" feature inside your banking app, if your bank offers one.

Set up an automatic transfer on payday. Money you never see in checking is money you don't miss.

Step 4: Should I use budget billing instead?

Many utilities offer budget billing (also called levelized or average billing). The company estimates your yearly use and charges the same amount each month.

Budget billing is a good fit if you want zero effort. A sinking fund gives you more control. Some people use both: budget billing for electricity and a sinking fund for propane deliveries, which often come in big, uneven payments.

Before you enroll, ask your utility three questions: How is the monthly amount set? How often is it adjusted? What happens with the difference at the end of the year?

Step 5: How can I make the spike smaller?

Saving for the spike is half the plan. The other half is shrinking it. Low-cost moves:

1. Lower the thermostat at night and when nobody is home. Energy.gov says you can save up to 10% a year on heating and cooling by turning the thermostat back 7 to 10 degrees for 8 hours a day. A programmable or smart thermostat does it for you.

2. Seal drafts. Weatherstripping on doors and caulk around windows are cheap at hardware stores and take an afternoon.

3. Change or clean the furnace filter on the schedule in your owner's manual. A clogged filter makes the system work harder.

4. Use ceiling fans. In summer, they let you set the AC a few degrees higher. In winter, many fans have a reverse switch that pushes warm air down.

5. Ask for a free or low-cost home energy audit. Many utilities offer one and may hand out free LED bulbs, low-flow shower heads or weatherstripping.

6. Check for weatherization help. The federal Weatherization Assistance Program helps eligible low-income households with insulation and repairs at no cost.

What if the big bill is already here?

Don't wait for a past-due notice. Act in this order:

1. Call the utility before the due date. Ask about a payment arrangement that spreads the balance over several months, and about any hardship or senior discounts.

2. Ask about shutoff protections. Many states limit disconnections during extreme cold or heat, or for households with medical needs. Rules vary by state.

3. Apply for LIHEAP. The Low Income Home Energy Assistance Program helps eligible households pay heating and cooling bills. Your state or local agency runs it, and funds can run out, so apply early in the season.

4. Dial 211. It connects you to local nonprofits, churches and charities that sometimes help with utility bills.

5. Avoid payday loans and title loans for utility bills. Their fees can be far higher than the bill.

If you're juggling several overdue bills, a nonprofit credit counselor (look for one affiliated with the National Foundation for Credit Counseling) can help you build a plan. This article is general information, not personal financial advice. For your situation, talk to a qualified professional.

Your next step today

Open your electric and gas accounts, write down the last 12 bills, and add them up. Divide by 12, add 10%, and set up an automatic transfer for that amount into a separate savings account on your next payday. If a big bill is due this month and you can't cover it, call your utility today and ask for a payment plan.

FAQ

What is a sinking fund?

It's money you set aside a little at a time for a cost you know is coming. Instead of paying a $300 heating bill in one shot, you save part of it each month ahead of time, so the spike doesn't come out of your emergency savings.

Is budget billing a good idea?

It can be, if you want the same bill every month. Your utility averages your yearly use into equal payments. You still pay for what you use, and many utilities adjust the amount once a year, so you may owe a catch-up payment. Ask how your utility handles that before you sign up.

What if I already can't pay this month's bill?

Call your utility right away and ask about payment plans, hardship programs and shutoff protections. Many states have winter rules that limit disconnections. You can also contact your local LIHEAP office or dial 211 to find energy assistance near you.

Should I use a credit card to pay a big utility bill?

Only if you can pay the card off in full right away. Carrying a utility bill on a high-interest card can cost you much more than the bill itself. A payment plan with the utility is often cheaper. A nonprofit credit counselor can help you compare options.

Educational content, not personalized financial advice. Sources cited where applicable.