What is an estoppel certificate: it is a short signed statement in which a tenant confirms the basic facts of their own tenancy, so that somebody about to buy or lend against the building can rely on them. The word is legal and the document is not complicated. This page explains it in plain terms, for a tenant who has been handed one and for a landlord who has been asked to collect them.
What it says
That a lease exists, when it started and when it ends, what the rent is, whether it is paid up to date, what deposit the landlord holds, and whether anything has been agreed that is not written in the lease. Some versions also ask whether the landlord is in default of anything, such as a repair promised and not done. That is the whole document, usually on one or two pages.
Why anybody asks
A building is bought or refinanced on the strength of its income, and that income is a set of leases. The seller's rent roll describes them; the estoppel is the tenant confirming the description. Buyers ask because the differences they find are usually innocent and expensive: a concession granted verbally, a deposit held in an amount nobody recorded, a repair that was promised by a manager who has since left.
What signing it means
Once you have confirmed a fact and somebody has relied on it in a transaction, you are generally prevented from asserting the opposite afterwards. That is what the word estoppel means and it is the reason to read the form rather than sign it as a formality. If something on it is wrong, correct it before signing: an amended estoppel is completely ordinary and is exactly what the process is for.
What a tenant should check
The rent figure and the date it last changed. Whether the form says you are paid to date when you are not, or in arrears when you are not. The deposit amount. And the question about side agreements, which is where you say out loud that the landlord agreed to fix the boiler or to let you keep the shed. That last line is the one that protects you after the building changes hands.
Questions people ask about what is an estoppel certificate
Do I have to sign an estoppel certificate?
Only if your lease requires it, which many commercial and some residential leases do within a set number of days of a request. Otherwise it is a request you may decline, though there is usually no reason to.
What if the form is wrong?
Correct it and sign the corrected version. That is normal, and it is far better than signing something inaccurate and relying on being able to explain later.
Does it affect my tenancy?
It should not change anything. It confirms what the lease already is. If signing it appears to change your position, something in it does not match your lease and that is the thing to raise.