# Form guides

> How to fill out common forms, line by line.

Canonical page: https://bettrpdf.com/forms  
This file: https://bettrpdf.com/forms.md  
Site index for agents: https://bettrpdf.com/llms.txt

- [How to fill out a vehicle bill of sale](https://bettrpdf.com/forms/vehicle-bill-of-sale.md): What the buyer and seller each need, the VIN and odometer lines, and when your state wants its own form.
- [How to fill out Form DS-82 to renew a passport by mail](https://bettrpdf.com/forms/passport-renewal-ds-82.md): Who can renew by mail, what to send with it, and the boxes people get wrong.
- [How to change your address with USPS](https://bettrpdf.com/forms/usps-change-of-address.md): Online versus the paper form, individual versus family, and everyone else you still need to tell.
- [How to fill out a lease renewal agreement](https://bettrpdf.com/forms/lease-renewal.md): Renewal term, new rent, what stays the same, and getting every tenant to sign before the old lease ends.
- [How to fill out a direct deposit authorization](https://bettrpdf.com/forms/direct-deposit.md): Where to find your routing and account numbers, how splits work, and what to attach.
- [How to fill out a pet addendum](https://bettrpdf.com/forms/pet-addendum.md): What to put for the pet, deposits versus fees versus pet rent, and the assistance-animal rule.
- [Tax preparation engagement letter](https://bettrpdf.com/forms/engagement-letter.md): What a tax engagement letter covers, what clients actually push back on, and how to get both spouses to sign from their phones.
- [Section 7216 consent to use and disclose tax return information](https://bettrpdf.com/forms/irs-7216-consent.md): When you need a 7216 consent, the mandatory wording, and why use and disclosure are signed separately.
- [How to fill out a rental application](https://bettrpdf.com/forms/rental-application.md): What landlords ask for, what you can leave blank, and how to send it back the same day.
- [How to fill out Form W-4 for 2026](https://bettrpdf.com/forms/w-4.md): What each step on the employee's withholding certificate asks for, which steps most people skip, and when to hand in a new one.
- [How to fill out a W-9 in 2026](https://bettrpdf.com/forms/w-9.md): Every line of the IRS Request for Taxpayer Identification Number, what goes in it, and the three mistakes that get a form sent back.
- [How to fill out a residential lease agreement](https://bettrpdf.com/forms/residential-lease-agreement.md): The clauses every lease needs, the fields that get left blank, and what changes state to state.
- [How to fill out a mutual NDA](https://bettrpdf.com/forms/mutual-nda.md): What each blank means, the exclusions that make an NDA enforceable, and when a one-way NDA is the better fit.
- [How to fill out an invoice that gets paid](https://bettrpdf.com/forms/invoice.md): Every field a finance team looks for, the arithmetic that gets invoices rejected, and the payment terms that actually shorten the wait.
- [How to write a change order the homeowner signs before the work starts](https://bettrpdf.com/forms/change-order.md): The small extras are where contractors lose money. A one-page change order, signed on your phone before you pick up the tool, ends the final-invoice argument.