A small estate affidavit cannot be filed until thirty days have passed since the death. Filing early gets the application rejected rather than corrected.

All heirs entitled to a share have to sign the affidavit, and two disinterested witnesses must swear to the family history. One estranged sibling who will not sign stops the process entirely.
Every county clerk's office in Texas keeps a rack of forms suggesting the estate can be settled without a full administration, and for a narrow set of families that is exactly true. The catch is that the qualifying conditions are not written on the form in the order you need them. They sit in the Estates Code, phrased as sworn statements the filer must be able to make, and the filer usually reads them for the first time while holding a pen. What follows is the checking a careful person does before that moment, route by route, with the specific facts that knock an estate out.
The small estate affidavit applies only when there is no will, when thirty days have passed since the death, when no administration has been granted or applied for, and when the assets, leaving aside the homestead and exempt property, exceed the known debts, again leaving aside anything secured by a lien on exempt property. That last clause is where most estates fail. An unpaid credit card balance, a hospital bill in collections, or a personal loan from a sibling counts as a debt, and if the debts swallow the non-exempt assets, the affidavit is unavailable. The estate value must also stay under the statutory ceiling, and every distributee has to sign.
Even a qualifying affidavit is narrow in what it transfers. It can pass the decedent's homestead, and it can pass bank accounts, vehicles, and personal property, but it cannot pass other real estate: a rent house, forty acres in another county, a lot at the lake. Families discover this after the affidavit is approved, when the title company reviewing a sale contract declines to insure. Check the property list first. If anything other than a homestead appears on it, this route was never the right one, and the time spent gathering distributee signatures is time not spent on the filing that actually works.
An affidavit of heirship is not a court proceeding at all. Two people who knew the family, own no interest in the estate, and can speak to marriages, children, and prior deaths sign before a notary, and the affidavit is recorded in the real property records of the county where the land sits. Nothing is adjudicated. It creates a record that a title examiner may accept, and after it has been on file for the statutory period, it carries evidentiary weight. Banks and brokerages frequently refuse it outright, because it binds nobody. Ask the institution holding the asset what it accepts before drafting.
Probating a will as a muniment of title is the cleanest option available and the most commonly misused. The applicant must prove the will is valid and then swear there are no unpaid debts other than those secured by liens on real estate, and that no administration is necessary. A mortgage is fine. Funeral expenses on a card, a final utility bill, and outstanding medical charges are not. There must also be no Medicaid estate recovery claim against the estate, which matters when the decedent received long-term care benefits. Confirm that point with the state before filing.
The order admitting a will to probate as a muniment of title is itself the transfer instrument. No executor is appointed, no letters testamentary issue, and there is nothing to serve as authority in dealings that require an appointed representative. Deeds, banks, and transfer agents are directed to act on the order. Within one hundred eighty days, the applicant files an affidavit stating that the will's terms have been carried out, or explaining what remains. Tax obligations survive independently: the Internal Revenue Service oversees the decedent's final return, and someone still has to sign and file it.
The disciplined move is to list every asset and every unpaid obligation on one page, mark which debts are secured and which are not, and mark which property is homestead. Three or four minutes of that work tells you which door in the courthouse is actually open, and spares the filing fee spent on the wrong one.