How do I bill hours beyond the retainer?

Bill the retainer as one line for the month, then list the extra work in the OS updates and bug fixes table as hours × your hourly rate, one line per task. Show the month's total hours and how they split between the retainer and the billed hours, so the client can check them.

How should I bill hosting and third-party services?

List each service at the amount the provider charged you, with the provider's invoice number or plan, in the pass-through table. In the Excel file these lines are added after the maintenance subtotal and aren't included in the sales tax.

Do unused retainer hours carry over to the next month?

That's up to your maintenance agreement. The sample's notes say unused hours don't carry over, but that's a sample term, so write your own terms in the agreement and in the invoice notes.

Free Mobile App Development Invoice for Monthly Maintenance

Q: What should a mobile app maintenance invoice include?

Your business details, an invoice number and date, payment terms, a due date and your agreement number, and the client you're billing. Then the app, the maintenance period, the hours used and the releases shipped, the monthly retainer, any extra hours with what they were for, hosting and services passed through at cost, any sales tax, the amount due and how to pay.

Q: Can I use this template to bill for building a new app?

It's built for monthly maintenance after launch. To bill a build by milestones, with testing, store submission and a retainer applied, use the Android app development invoice instead.

A free invoice for a month of mobile app maintenance, with a monthly retainer that includes a set number of hours, extra hours for OS updates and bug fixes at an hourly rate, and hosting and services passed through at cost, as a blank PDF form plus Word and Excel files filled with sample values

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Quick answer:This page has a free mobile app maintenance invoice for a developer or studio that looks after a client's app after launch. It bills a monthly retainer that includes a set number of hours, then OS-update and bug-fix work beyond the retainer as hours × an hourly rate, then hosting and third-party services passed through at cost. Sales tax, if it applies, is worked out on the maintenance services only, from a rate cell in the Excel file. It records the app, the maintenance period, the hours used and the releases shipped. For billing the build of a new app by milestones, use the Android app development invoice instead. It comes as a blank print-and-fill PDF and as Word and Excel files filled with sample values.

APP MAINTENANCE INVOICE

Developer

Business name:: Example App Studio
Address:: 84 Example Street, Suite 5, Sampletown
Phone / email:: [Phone or email]

Invoice details

Invoice no.:: AM-1026
Invoice date:: Nov 2, 2026
Payment terms:: Net 15
Due date:: Nov 17, 2026
Agreement no.:: MSA-0314

Bill to (client)

Company:: Example Fitness Co.
Attention:: Jordan Example, Product
Address:: 220 Sample Avenue, Sampletown
Email:: [Email]

App and period

App:: Example Fitness (iOS and Android)
Maintenance period:: Oct 1 to Oct 31, 2026
Hours used:: 19.5 (10 included in the retainer, 9.5 billed below)
Releases:: Version 3.8.1 (Oct 14) and 3.9.0 (Oct 28)

Monthly maintenance retainer

Item: Maintenance retainer, October 2026Amount: 1,200.00
Details:
Includes 10 hours of maintenance
Qty:
1
Unit:
month
Rate:
1,200.00

Monthly maintenance retainer: line items
Item	Details	Qty	Unit	Rate	Amount
Maintenance retainer, October 2026	Includes 10 hours of maintenance	1	month	1,200.00	1,200.00

OS updates and bug fixes beyond the retainer

Item: iOS 26 compatibility updateAmount: 660.00
Details:
Build, test and store resubmission
Qty:
6
Unit:
hour
Rate:
110.00
Item: Bug fix: checkout crash on Android 15Amount: 385.00
Details:
Reported Oct 9, released Oct 14
Qty:
3.5
Unit:
hour
Rate:
110.00

OS updates and bug fixes beyond the retainer: line items
Item	Details	Qty	Unit	Rate	Amount
iOS 26 compatibility update	Build, test and store resubmission	6	hour	110.00	660.00
Bug fix: checkout crash on Android 15	Reported Oct 9, released Oct 14	3.5	hour	110.00	385.00

Additional hours subtotal1,045.00

Hosting and services, passed through at cost

Item: Cloud hosting, OctoberAmount: 184.20
Details:
[Provider invoice no.]
Qty:
1
Unit:
month
Rate:
184.20
Item: Crash reporting serviceAmount: 29.00
Details:
Team plan, October
Qty:
1
Unit:
month
Rate:
29.00
Item: Push notification serviceAmount: 45.00
Details:
Up to 50,000 messages
Qty:
1
Unit:
month
Rate:
45.00

Hosting and services, passed through at cost: line items
Item	Details	Qty	Unit	Rate	Amount
Cloud hosting, October	[Provider invoice no.]	1	month	184.20	184.20
Crash reporting service	Team plan, October	1	month	29.00	29.00
Push notification service	Up to 50,000 messages	1	month	45.00	45.00

Subtotal: 2,245.00
Sales tax on maintenance services, if applicable (0%): 0.00
Hosting and services, passed through at cost: 258.20
Amount due: 2,503.20

How to pay

Accepted methods:: Bank transfer, ACH or check
Account name:: [Account name]
Bank details:: [Bank name, account and routing numbers]
Payment reference:: Invoice AM-1026

Maintenance notes

Sample terms: the retainer covers up to 10 hours a month; extra hours are billed at 110.00 an hour.
Hosting and services are passed through at cost from the providers' monthly bills.
Unused retainer hours don't carry over to the next month.

Thank you. Please quote the invoice number with your payment.

Mobile app maintenance invoice: sample preview. Download it below.

Key Features

Everything you need in a professional invoice template.

Developer details, invoice number, dates, payment terms and agreement number

Bill to (client): company, attention line, address and email

App and period: platforms, maintenance period, hours used and releases

Monthly maintenance retainer line with included hours

OS-update and bug-fix hours beyond the retainer × hourly rate, with a subtotal

Hosting and third-party services passed through at cost, outside the tax

Sales tax on maintenance services from a rate cell (Excel) and amount due

Blank one-page PDF to print and fill in; Word and Excel versions with sample values to overwrite

Download the invoice template

The PDF is a blank invoice to print and fill in by hand. The Word and Excel files contain the sample details shown in the preview, ready for you to replace with your own. In the Excel file, each line amount is a formula: "Qty" × "Rate". The section subtotals, subtotal, tax, pass-through costs and amount due are formulas too. The tax rate sits in its own cell, so you can change it.

APP MAINTENANCE INVOICE

Developer

Business name:: Example App Studio
Address:: 84 Example Street, Suite 5, Sampletown
Phone / email:: [Phone or email]

Invoice details

Invoice no.:: AM-1026
Invoice date:: Nov 2, 2026
Payment terms:: Net 15
Due date:: Nov 17, 2026
Agreement no.:: MSA-0314

Bill to (client)

Company:: Example Fitness Co.
Attention:: Jordan Example, Product
Address:: 220 Sample Avenue, Sampletown
Email:: [Email]

App and period

App:: Example Fitness (iOS and Android)
Maintenance period:: Oct 1 to Oct 31, 2026
Hours used:: 19.5 (10 included in the retainer, 9.5 billed below)
Releases:: Version 3.8.1 (Oct 14) and 3.9.0 (Oct 28)

Monthly maintenance retainer

Item: Maintenance retainer, October 2026Amount: 1,200.00
Details:
Includes 10 hours of maintenance
Qty:
1
Unit:
month
Rate:
1,200.00

Monthly maintenance retainer: line items
Item	Details	Qty	Unit	Rate	Amount
Maintenance retainer, October 2026	Includes 10 hours of maintenance	1	month	1,200.00	1,200.00

OS updates and bug fixes beyond the retainer

Item: iOS 26 compatibility updateAmount: 660.00
Details:
Build, test and store resubmission
Qty:
6
Unit:
hour
Rate:
110.00
Item: Bug fix: checkout crash on Android 15Amount: 385.00
Details:
Reported Oct 9, released Oct 14
Qty:
3.5
Unit:
hour
Rate:
110.00

OS updates and bug fixes beyond the retainer: line items
Item	Details	Qty	Unit	Rate	Amount
iOS 26 compatibility update	Build, test and store resubmission	6	hour	110.00	660.00
Bug fix: checkout crash on Android 15	Reported Oct 9, released Oct 14	3.5	hour	110.00	385.00

Additional hours subtotal1,045.00

Hosting and services, passed through at cost

Item: Cloud hosting, OctoberAmount: 184.20
Details:
[Provider invoice no.]
Qty:
1
Unit:
month
Rate:
184.20
Item: Crash reporting serviceAmount: 29.00
Details:
Team plan, October
Qty:
1
Unit:
month
Rate:
29.00
Item: Push notification serviceAmount: 45.00
Details:
Up to 50,000 messages
Qty:
1
Unit:
month
Rate:
45.00

Hosting and services, passed through at cost: line items
Item	Details	Qty	Unit	Rate	Amount
Cloud hosting, October	[Provider invoice no.]	1	month	184.20	184.20
Crash reporting service	Team plan, October	1	month	29.00	29.00
Push notification service	Up to 50,000 messages	1	month	45.00	45.00

Subtotal: 2,245.00
Sales tax on maintenance services, if applicable (0%): 0.00
Hosting and services, passed through at cost: 258.20
Amount due: 2,503.20

How to pay

Accepted methods:: Bank transfer, ACH or check
Account name:: [Account name]
Bank details:: [Bank name, account and routing numbers]
Payment reference:: Invoice AM-1026

Maintenance notes

Sample terms: the retainer covers up to 10 hours a month; extra hours are billed at 110.00 an hour.
Hosting and services are passed through at cost from the providers' monthly bills.
Unused retainer hours don't carry over to the next month.

Thank you. Please quote the invoice number with your payment.

Mobile app maintenance invoice

An invoice for a month of mobile app maintenance: a monthly retainer that includes a set number of hours, OS update and bug-fix hours beyond the retainer at an hourly rate, hosting and third-party services passed through at cost, a tax rate cell on maintenance services and the amount due.

A request for payment — shows the amount due

Download

What this app maintenance invoice is for

This template is for a developer or studio billing a client each month for looking after an app that is already live: keeping it working on new OS versions, fixing bugs, shipping updates and paying for the services it runs on. The sample is October's invoice for a fitness app on iOS and Android, with a 10-hour retainer, 9.5 extra hours for an iOS update and an Android bug fix, and three hosting and service bills passed through at cost.

It isn't for building a new app. To bill a build by milestones, with testing, store submission and a retainer applied, use the Android app development invoice. For a website project, use the web development invoice.

The app maintenance invoice has:

Developer: business name, address, and phone or email.
Invoice details: invoice number, invoice date, payment terms, due date and Agreement no. for your maintenance agreement.
Bill to (client): company, attention line, address and email.
App and period: the app and its platforms, the maintenance period, Hours used (split into hours included in the retainer and hours billed) and the Releases shipped that month.
Monthly maintenance retainer: one line for the month's retainer, with the included hours in Details.
OS updates and bug fixes beyond the retainer: extra work as hours × rate, with an "Additional hours subtotal".
Hosting and services, passed through at cost: each provider's monthly charge.
Totals: Subtotal, "Sales tax on maintenance services, if applicable", "Hosting and services, passed through at cost" and Amount due.
How to pay: accepted methods, placeholders for the account name and bank details, and the payment reference to quote.
Maintenance notes: the sample retainer terms, how pass-through costs are billed, and what happens to unused hours.

It comes as three files:

PDF: a one-page blank form to print and fill in by hand, with a blank for the tax percentage.
Word (.docx) and Excel (.xlsx): the same layout filled with sample values for you to overwrite.

In the Excel file:

Each line's Amount is Qty × Rate, rounded to the cent. The extra-hours and pass-through tables each have one empty row.
The Subtotal adds the retainer and the extra hours.
"Sales tax on maintenance services, if applicable" has a rate cell (0% in the sample) and is worked out on that Subtotal only.
"Hosting and services, passed through at cost" adds the pass-through lines. It isn't included in the tax.
Amount due = Subtotal + sales tax + hosting and services.

The file's tip says: to leave out the sales tax, set its rate to 0%, and don't delete the rows, because the totals refer to them. In the Word file the tax line shows its rate in the label ("(0%)"), so update both if you change it.

The sample adds up like this:

Retainer: 1 month × 1,200.00, which includes 10 hours.
Beyond the retainer: 6 hours for an iOS compatibility update and 3.5 hours for an Android bug fix, 9.5 hours × 110.00 = 1,045.00. Subtotal: 2,245.00. Sales tax: 0.00 at 0%.
Passed through at cost: cloud hosting 184.20, crash reporting 29.00 and push notifications 45.00, for 258.20.
Amount due: 2,503.20. The invoice is dated Nov 2, 2026 on Net 15 terms, so it's due Nov 17, 2026.

These figures only show how the form works. They are not typical rates or prices.

Retainer hours and extra hours

The retainer is one line per month, with the hours it includes in Details ("Includes 10 hours of maintenance").
Hours used in the App and period block shows the month's total and how it splits, as in the sample: "19.5 (10 included in the retainer, 9.5 billed below)". The client can check that only the hours beyond the retainer are billed.
Extra work goes in the OS updates and bug fixes table, one line per task, with what was done and when in Details ("Reported Oct 9, released Oct 14").
Releases lists the versions shipped that month, so the invoice matches what the client saw in the stores.

How many hours the retainer includes, the hourly rate for extra work and whether unused hours carry over are business terms you set in your maintenance agreement. The sample's notes are marked "Sample terms" ("the retainer covers up to 10 hours a month; extra hours are billed at 110.00 an hour") and say that unused hours don't carry over.

Hosting and services passed through at cost

List each hosting or third-party service the client pays for through you, at the amount the provider charged, with the provider's invoice number or plan in Details. The sample's notes say these are "passed through at cost from the providers' monthly bills". Keep the provider bills, so you can show the client what each line is based on.

These lines sit outside the maintenance subtotal and aren't included in the sales tax in the Excel file. Whether tax applies to your services, or to anything you pass through, depends on the rules where you work, so check them before you set the rate.

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What's included in this invoice template

	This invoice	Android app development	Web development
For	Monthly maintenance after launch	Building a new app	A website project
Main charges	Retainer + extra hours	Fixed-fee milestones	Milestones + extra hours
Passed through	Hosting and services	Platform and service fees	Hosting, domain, licenses
Retainer credit taken off?	No	Yes	Yes

When this isn't for you

If you're billing the build of a new app, use the milestone-based Android app development invoice instead. If you bill maintenance only by the hour, with no retainer, set the retainer quantity to 0 and list every hour in the extra-hours table. And if your project or agency software already issues invoices, use it so your time records and invoices match.