KG 45 — Report of Changes for Child Benefit (Veränderungsmitteilung)

What is KG 45 — Veränderungsmitteilung (Kindergeld)?

KG 45, the Veränderungsmitteilung, is the Familienkasse's form for reporting changes once you already receive Kindergeld. It is published by the Familienkasse of the Bundesagentur für Arbeit (Federal Employment Agency); the current edition is KG 45 - 01.25, Stand Mai 2025. Where KG 1 starts a claim, KG 45 keeps it up to date: a new address or bank account, a change in marital status, a child moving in or out, work abroad, another child-related benefit, or news about an adult child's training or job.

Reporting changes is not optional. The declaration on the form reminds you that you must tell the Familienkasse without delay (unverzüglich) about every change that matters for child benefit. Late reports can lead to Kindergeld being paid to the wrong account, or paid when it should not be and then reclaimed. The form is in German and made of separate blocks, each with its own tick box — you fill in only the blocks that apply.

FileIt explains each block of KG 45 in English with the German term alongside. You switch on only the parts that changed, and FileIt ticks the matching boxes and prints your answers onto the official German PDF, with your IBAN one character per box. Names can be pre-filled from the People records in your vault, and the finished PDF is saved there. FileIt does not send anything to the Familienkasse: you print, sign by hand and post it yourself.

Who needs to fill out KG 45 — Veränderungsmitteilung (Kindergeld)?

• Parents and other people who already receive Kindergeld and have a Kindergeld number.
• Families who have moved house, within Germany or abroad.
• Anyone who wants the Kindergeld (and Kinderzuschlag, if received) paid into a different bank account.
• Parents whose marital status has changed — marriage, divorce, separation, widowhood or a registered partnership.
• Parents whose household has changed because a child moved in or moved out.
• Families where a parent or partner starts work abroad, or another child benefit (such as a foreign family benefit) starts being paid.
• Parents of children aged 18 or over whose training, studies or work situation has changed.

When to use KG 45 — Veränderungsmitteilung (Kindergeld)

• As soon as the change happens — the form's declaration says changes must be reported without delay.
• When you move, change bank, or your marital status changes.
• When a child joins or leaves your household. For a child who joins, the form says you enclose a KG 1 application and an Anlage Kind.
• When an adult child starts, interrupts, gives up or finishes school, training or university, or starts working.
• When you, your spouse or partner, or the other parent starts employed or self-employed work abroad.

What you need before you start

• Your Kindergeld number (Kindergeld-Nr.), shown on every letter from the Familienkasse.
• The date each change took effect.
• Your new address, if you moved.
• The new IBAN, BIC (for an account outside Germany) and bank name, and the account holder's name if it isn't you.
• Children's names and dates of birth for any child moving in or out, and the address of the person a child now lives with.
• Employer or business name and address for work abroad or an adult child's job, and the child's weekly working hours.
• Details of any other child-related benefit: who gets it, what it is, the monthly amount, and who pays it.
• Evidence for the change, such as a marriage certificate, a registration certificate or a school, training or employment certificate — or note that it will follow.

What’s on KG 45 — Veränderungsmitteilung (Kindergeld)

The 2025 edition has 2 pages. FileIt asks for it in 11 parts:

1. Before you start — who is reportingPerson receiving kindergeld (kindergeldberechtigte person)
2. New address (Meine Anschrift hat sich geändert)Person receiving kindergeld (kindergeldberechtigte person)
3. New bank account (Auf folgendes Konto soll das Kindergeld künftig überwiesen werden)Person receiving kindergeld (kindergeldberechtigte person)
4. Change in marital status (Mein Familienstand hat sich geändert)Person receiving kindergeld (kindergeldberechtigte person)
5. Children in your household (Die Anzahl der in meinem Haushalt lebenden Kinder hat sich geändert)Person receiving kindergeld (kindergeldberechtigte person)
6. Work abroad or posting abroad (Beschäftigung im Ausland bzw. Entsendung ins Ausland)Person receiving kindergeld (kindergeldberechtigte person)
7. Another child-related benefit (andere kindbezogene Leistung)Person receiving kindergeld (kindergeldberechtigte person)
8. Your adult child's training or work (Mein volljähriges Kind)Person receiving kindergeld (kindergeldberechtigte person)
9. Other changes (sonstige Veränderungen)Person receiving kindergeld (kindergeldberechtigte person)
10. Evidence and remarks (Nachweise, Ergänzungen)Person receiving kindergeld (kindergeldberechtigte person)
11. Declaration and signature (Unterschrift)Person receiving kindergeld (kindergeldberechtigte person)

How to fill out KG 45 — Veränderungsmitteilung (Kindergeld), step by step

1 Header — name, Kindergeld-Nr. and phone

At the top go the surname and first name of the person who receives Kindergeld, the Kindergeld number, and optionally a daytime phone number. The Kindergeld number is how the Familienkasse finds your file, so it is required in FileIt.

2 Meine Anschrift hat sich geändert (new address)

Give your new street and house number, postcode and town, country, and the date the new address is valid from. If you have moved abroad, the work-abroad block below may also apply, because a move abroad can change which country pays family benefits.

3 Auf folgendes Konto (new bank account)

Enter the IBAN, the BIC and the bank's name, say whether the account holder is you or someone else, and give the date the change applies from. The block covers Kindergeld and, where you get it, Kinderzuschlag. FileIt checks the IBAN's check digits and prints it one character per box.

4 Mein Familienstand hat sich geändert (marital status)

Tick your new status — married, divorced, widowed, permanently separated, in a registered civil partnership, or civil partnership dissolved — and give the date since when it applies.

5 Die Anzahl der in meinem Haushalt lebenden Kinder hat sich geändert (children in the household)

Two sub-parts. If a child moved in, give the child's name, date of birth and the date they joined your household: you are claiming Kindergeld for them, and the form says the KG 1 application and Anlage Kind are enclosed.

If a child moved out, give the child's name, date of birth, the date they left, and the name and address of the person they now live with.

6 Beschäftigung im Ausland bzw. Entsendung ins Ausland (work abroad)

Say who started work abroad — you, your spouse or registered partner, or the child's other parent (with name and date of birth) — whether it is employed or self-employed work, the employer's or business's name and address, and the start date.

7 Andere kindbezogene Leistung (another child-related benefit)

On page 2: for which child another benefit is paid, since when, the person who receives it, what kind of benefit it is, the monthly amount, and the name and address of the paying body. A typical case is a family benefit paid by another country.

8 Mein volljähriges Kind (your adult child)

For a child aged 18 or over, report school, training or studies that were started, interrupted, given up or finished, with the date — and, if finished, the qualification and subject, plus the career goal if it differs.

If the child was, is or will be working, give the job, tick minijob and/or other work with the from and until dates, the total agreed weekly hours, and the employer's name and address. The form asks for details of several jobs on a separate sheet.

9 Sonstige Veränderungen (other changes)

Anything else that matters under the Merkblatt Kindergeld. The form's examples include the child starting voluntary military service or another voluntary service, an internship, the child's pregnancy, or the child caring for their own child on parental leave. Always give the start date or the period.

10 Nachweise and Ergänzungen (evidence and remarks)

Say whether the evidence for the ticked changes is enclosed (beigefügt) or will follow (reiche ich nach). There is also space for remarks — the form's example is explaining why a change is reported late.

11 Datum and Unterschrift (date and signature)

By signing you confirm the details are complete and true, that you know changes must be reported without delay, and that you have read the Merkblatt Kindergeld. The person entitled to Kindergeld, or their legal representative, signs by hand.

Common mistakes to avoid

• Leaving out the Kindergeld number, which makes the report hard to match to your file.
• Waiting to report: the form stresses that changes must be reported without delay.
• Reporting a child who moved in without enclosing a KG 1 application and an Anlage Kind for them.
• Giving a new bank account without the date it should apply from, or forgetting the account holder's name when it isn't you.
• Forgetting the dates. The form asks for a start date or period for every change.
• For an adult child who finished training, leaving out the qualification and subject.
• Ticking that evidence is enclosed and then not putting it in the envelope.
• Posting the form unsigned.

After you fill it out

Print KG 45, check the ticked blocks, and sign it by hand (or your legal representative signs). Add the evidence you said is enclosed, and for a child who has joined your household, a completed KG 1 and Anlage Kind.

Post it to your Familienkasse; its address is on your Kindergeld letters. FileIt does not send the form for you. The Familienkasse also accepts change reports through its own online services; this FileIt route produces the signed paper version.

Keep a copy in your FileIt vault next to your Kindergeld decision, so you have a record of what you reported and when. Report again whenever something else changes.

KG 45 — Veränderungsmitteilung (Kindergeld): frequently asked questions

Official sources

• Blank form (PDF), published by Bundesagentur für Arbeit — Familienkasse: https://www.arbeitsagentur.de/datei/kg45_ba032780.pdf
• Official instructions and guidance: https://www.arbeitsagentur.de/familie-und-kinder/downloads-familie-und-kinder/formulare-kindergeld
• Edition shown on this page: KG 45 - 01.25 - Stand Mai 2025 (checked 2026-09-26).

FileIt is not affiliated with or endorsed by Bundesagentur für Arbeit — Familienkasse or any government. This page explains the form in general terms and is not legal, tax or immigration advice. Always read the official instructions, and check that you are using the edition the recipient accepts. Page last reviewed 2026-09-26.

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