How to split a phone bill: lines, devices and taxes
Quick answer
Split a phone bill in three parts. Each person pays their own lines (plan charge ÷ lines × their lines), their own device payment, and a share of taxes and fees in proportion to those two amounts. On a $261.40 bill with four lines, the three people pay $116.80, $44.49 and $100.11.
Key points
- A phone bill is three things: per-line plan charges, each person's device installments, and taxes and fees.
- Each person pays their lines, plus their own device payment, plus taxes and fees in proportion to that subtotal.
- When someone leaves, the plan may fall by less than their line, so the others' shares rise, and the leaver still owes any remaining device payments.
- In EvenOut, use "Exact amounts" with the Phone category. The pill reads "$X left to assign" until the amounts match the bill.
On this page
What is a phone bill made of?
A shared phone bill has three parts that should be split differently: the plan charge for each line, each person’s device payments, and taxes and fees. An even split gets it wrong as soon as two people have different numbers of lines or different phones.
- Lines. What the plan charges for each line. If the bill shows one plan price, divide it by the number of lines to get a price per line.
- Devices. Each person’s monthly installment on their own phone or other device. These are personal.
- Taxes and fees. The extra charges at the bottom of the bill. This page shares them in proportion to what each person’s lines and device cost.
How do you work out each person’s share?
Each person pays their lines, plus their own device payment, plus a share of taxes and fees in proportion to those two. Five steps do it.
- Price per line. Plan charge ÷ number of lines.
- Each person’s subtotal. Their lines × price per line, plus their device payment.
- Check the subtotals. They should add up to the bill before taxes and fees.
- Share of taxes and fees. Taxes and fees × the person’s subtotal ÷ all subtotals.
- Each person’s total. Subtotal plus share of taxes and fees. The totals should add up to the bill.
Say Mia holds the account and has 2 lines, Noor has 1 and Omar has 1 (made-up numbers). The plan charge is $160 for 4 lines, which is $40 a line. Mia pays $25.00 a month on her phone ($900 over 36 months) and Omar pays $50.00 ($1,200 over 24 months). Noor has no device payment. Taxes and fees are $26.40, so the bill is $160 + $25 + $50 + $26.40 = $261.40.
| Person | Lines and device | Taxes and fees | Pays |
|---|---|---|---|
| Mia | 2 × $40 + $25.00 = $105.00 | $11.80 | $116.80 |
| Noor | 1 × $40 = $40.00 | $4.49 | $44.49 |
| Omar | 1 × $40 + $50.00 = $90.00 | $10.11 | $100.11 |
| Total | $235.00 | $26.40 | $261.40 |
Mia’s share of taxes and fees is $26.40 × $105 ÷ $235 = $11.80, and the others follow the same way. The check is $116.80 + $44.49 + $100.11 = $261.40.
What changes when someone leaves the plan?
Two things: the plan price may not fall by the leaver’s whole line, and the leaver may still owe device payments.
Say the plan charges $160 for 4 lines but $135 for 3 lines (made-up prices, picked to show the effect). If Omar’s line goes, the bill falls by $25, not $40. The remaining three lines cost $45 each instead of $40. Mia, with 2 lines, pays $10 more a month ($90 instead of $80), and Noor pays $5 more ($45 instead of $40). Decide in advance whether the people who stay carry that $15, or whether the leaver shares it for a set time.
Device payments need their own rule. If Omar leaves after 10 of his 24 payments, 14 payments of $50.00 remain, which is $700.00. Agree whether he keeps paying $50.00 a month or pays the $700.00 at once, and ask the carrier how it treats the remaining installments when a line is removed.
How do you set it up in EvenOut?
“Exact amounts” fits this bill, because each person’s total is a different number.
- Open the group or friend page and tap “Add expense”. Type $261.40. Write “Phone bill” in “What was this for?”. EvenOut suggests a category from the description, and “Phone” is one of its 33 built-in categories.
- Choose the account holder under “Paid by”, here Mia.
- Tap the split chip and choose “Exact amounts”. Type Mia $116.80, Noor $44.49 and Omar $100.11. After the first two, the pill reads “$100.11 left to assign”. When the three add up it reads “All assigned”.
- Save. Noor and Omar now owe Mia $44.49 and $100.11. They pay her outside the app, and she records each payment with “Settle up”.
Use a monthly repeat only if the bill is identical every month. A repeat adds the same payer and split each time, so it fits a fixed plan with fixed installments and not a bill that moves with taxes or usage. To set one up, open “Photo, repeat, pending or note”, choose “Repeat” and then “Monthly”. When a device is paid off, tap “Stop repeating” and set up a new one with the new amounts. If the bill changes, add each month’s bill by hand instead.
As of October 2026, Splitwise’s help center lists exact amounts among its split types and describes monthly recurring expenses.
What should you do next?
Write down the price per line, each person’s device payment and the rule for leavers, then add the first bill. Phone bills sit alongside other household costs, and how to split utilities covers the ones that vary with use. Internet has its own wrinkles, covered in how to split an internet bill, and tracking recurring bills shows how to keep the fixed ones from being forgotten.
Frequently asked questions
Should taxes and fees be split per line instead of by amount?
It is simpler, but less exact. In the example, $26.40 across 4 lines is $6.60 a line, so Mia pays $13.20 and Noor and Omar pay $6.60 each. That charges Noor $2.11 more than the proportional split ($4.49) and Omar $3.51 less ($10.11). Per line is fine when nobody has a device payment.
When should we redo the split?
Whenever a line is added or removed, a phone is paid off or the plan changes. When Mia's $25.00 device payment ends, it drops out of her subtotal and her share of taxes and fees shrinks with it. Put a reminder on the date the last installment ends.
Who gets the line when a parent pays for a child's phone?
For this method, a line counts toward whoever pays for it, not whoever uses it. In the example, Mia has 2 lines because she pays for a second one, and her subtotal covers both. If the bill prints a different price for a line, use that price instead of the average.
Sources
Checked October 6, 2026.
- Splitwise: What are the different ways I can split an expense?
- Splitwise: How can I manage recurring expenses?
Keep reading
- Guide How to split utilities: four methods with the same bill One $394 month of electric, water, internet and gas, split four ways: equal, by head, by days home and fixed plus variable. Exact shares for each method.
- Guide How to split an internet bill (and who pays for upgrades) A flat internet plan splits equally: $60 for 4 people is $15 each. Then settle who holds the account, who pays install fees and who funds an upgrade.
- Guide How to track recurring bills that change every month Fixed bills repeat on their own and variable bills start from last month's entry. Examples, a monthly checklist and EvenOut's Weekly, Monthly or Yearly repeats.