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Co-Signer Addendum

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Create new lease addendum
At a table, a landlord shows a renter and a cosigner a blank addendum page beside an open lease binder and a pen
  1. The cosigner backs the rent
  2. Attach it to the signed lease
  3. Everyone signs the page
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About the Co-Signer Addendum

The Co-Signer Addendum is a lease addendum written to be portable across every U.S. state. Adds a guarantor mid-lease. Stronger than a side letter, with waiver of notice and direct-pursuit language. Preview and fill the document online for free. Sign in to download a watermarked copy, or review Prime plans for clean PDFs and signing.

What this lease addendum covers

This form contains 8 sections. Here is the full outline of what it addresses:

  1. 1. ATTACHMENT TO LEASE
  2. 2. CO-SIGNER
  3. 3. GUARANTEE OF PERFORMANCE
  4. 4. NO RIGHT TO POSSESSION
  5. 5. WAIVER
  6. 6. JOINT AND SEVERAL LIABILITY
  7. 7. NOTICE TO CO-SIGNER
  8. 8. EFFECTIVE DATE

Frequently asked questions

Is the Co-Signer Addendum free to preview?

Yes. You can preview and fill out the form for free. A free account lets you download a watermarked copy. Prime adds PDFs without a watermark and electronic signing. Check the plan details before choosing.

Which states does the Co-Signer Addendum apply to?

This lease addendum is prepared for every U.S. state. Adds a guarantor mid-lease. Stronger than a side letter, with waiver of notice and direct-pursuit language.

Can I fill it out and e-sign it online?

Fill out the form in your browser, then check the document and who needs to sign. Paid plans let you send it for signature and keep a signing record. Confirm the applicable delivery, consent and signature requirements before sending.

What Prime adds

Prepare and review your document.

  • PDF without a watermark. You can select and copy the text.
  • Auto-fills from your portfolio. Tenant, address, amounts pulled straight from your unit ledger.
  • E-signed with audit trail. Tenants sign in the browser. Every signature, IP, and timestamp is logged.
  • Access to the full library. The plan includes forms for every state, with no per-form fee.
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Use this form inside Rentari

Keep the form with the lease, tenant and rent records it belongs to.