How to Add a New Line of Business to Your Existing BIR Registration

Adding a new line of business to a BIR registration you already hold means updating your existing Certificate of Registration, not applying for a new TIN. Philippine taxpayers who start a second business activity — a registered retailer who begins offering repair services, or a freelancer who opens an online store — file BIR Form 1905 to add the new registered activity and its Philippine Standard Industrial Classification (PSIC) code to their current registration record.

What counts as a “new line of business” under BIR rules? #

A new line of business is a distinct registered activity added to a registration that already exists — different from opening a new branch (a new physical location) or switching your primary business entirely. A sole proprietor registered as an online retailer who starts also offering graphic design services, or a corporation registered for manufacturing that adds a wholesale distribution activity at the same address, is adding a line of business, not registering a new taxpayer.

The distinction matters because each scenario uses a different part of BIR Form 1905 and triggers different documentary requirements:

If your new activity is at the same registered address as your existing business, you are almost always looking at a line-of-business update, not a branch registration.

Why the BIR requires you to update your registered line of business #

Every registered taxpayer’s obligation to keep BIR records current for changes like this comes from Section 236 of the National Internal Revenue Code (NIRC), the same provision that requires initial registration in the first place. A compliance guide describing BIR Form 1905’s legal basis summarizes the update duty this way, citing Section 236:

“Pursuant to Section 236 of the National Internal Revenue Code, any registered taxpayer shall, whenever applicable, update his registration information with the Revenue District Office where he is registered, specifying therein any change in tax type and other taxpayer details (i.e. change in registered activities/line of industry, change in registered name/trade name and change in accounting period).”

That “change in registered activities/line of industry” is exactly what adding a second business line is. Skipping the update does not stop the new activity from being taxable — it still generates income tax, and VAT or percentage tax exposure if it pushes you over a threshold — but it does mean you are issuing invoices and receipts for an activity your Certificate of Registration (BIR Form 2303) does not list, which a BIR tax mapping visit or audit can flag as an unregistered activity in addition to whatever tax is owed on it.

How to file BIR Form 1905 to add a line of business #

Filing to add a line of business follows the same form as every other BIR Form 1905 transaction, but you check a different box and describe the new registered activity precisely enough for the BIR to assign or confirm a PSIC code. Follow these steps:

1. Secure the documents that support the new activity — an updated DTI Certificate of Business Name if you operate as a sole proprietor under a name that now covers the new line, or amended SEC Articles of Incorporation and a General Information Sheet if the new activity falls outside a corporation’s registered primary or secondary purpose.
2. Accomplish BIR Form 1905, checking the box for change or addition of registered activity/line of business in Part II, and write a specific description (for example, “repair of computers and peripheral equipment” rather than just “services”).
3. Look up or confirm the applicable PSIC code for the new activity, since the BIR uses this classification to route your registration and, for online sellers, to satisfy the industry-code fields ORUS checks under the current Registration Seal Badge rules.
4. File the form at your current RDO — the same office where your existing registration is on file, not a new one, since you are not transferring jurisdiction.
5. Submit your existing BIR Form 2303, a valid government-issued ID, and, if a representative is filing on your behalf, a notarized Special Power of Attorney or Board Resolution.
6. Wait for the annotated or reissued Certificate of Registration listing both your original and new registered activities before you start invoicing under the new line, and update your books of accounts and invoicing system to reflect it.

Processing time varies by RDO. Filings submitted through the Online Registration and Update System (ORUS) at orus.ph are generally reviewed faster than paper filings at the counter, but neither channel has a single fixed turnaround — confirm the current expected timeline with your RDO when you file.

Documents you need #

• Accomplished BIR Form 1905, with the line-of-business/registered-activity section completed
• Existing BIR Form 2303 (Certificate of Registration), to be annotated or reissued
• Updated DTI Certificate of Business Name (sole proprietors) or amended SEC documents (corporations and partnerships), if the new activity requires one
• Valid government-issued ID of the registered owner or authorized signatory
• Notarized Special Power of Attorney or Board Resolution, if filed by a representative

Do you need a new TIN, a new COR number, or a new registration fee? #

No to all three. Adding a line of business updates the registration record you already have — it does not create a new taxpayer, a new registered location, or a new Certificate of Registration number. This is the detail that most often confuses taxpayers who assume a second business activity needs to be registered from scratch the way a first-time business registration does.

It’s also unlike registering a new branch, which does create a new registered place of business under a branch-code suffix. And unlike the old per-location cost, there is no separate BIR fee for a line-of-business update at all — the ₱500 Annual Registration Fee that once applied per registered establishment was abolished for every location, head office and branch alike, effective January 22, 2024 under the Ease of Paying Taxes (EOPT) Act (Republic Act No. 11976). For the full mechanics of that change, see Is the ₱500 Annual BIR Registration Fee Still Required?

Worked example: an online seller adding a repair-services line #

Consider a home-based Shopee seller registered with the BIR since 2022 under the line of business “retail sale via e-commerce platforms,” operating out of Marikina City. In September 2026 she starts a second income stream: accepting paid repair jobs for the phone accessories she sells, advertised through the same Shopee storefront and a separate Facebook page.

Because she is now earning income from a distinct activity — repair services, not retail — that her Certificate of Registration does not list, she updates her registration before invoicing repair customers:

1. She confirms her DTI Certificate of Business Name already covers “trading and repair services” broadly enough, so no DTI amendment is needed; if it named only “retail trading,” she would need to update it first.
2. She accomplishes BIR Form 1905, checking the box to add a registered activity, and describes it as “repair of consumer electronics” — matching the closest PSIC code for that activity rather than leaving it generic.
3. She files the form at her home RDO with her existing BIR Form 2303 and a valid ID — no new RDO, since her address has not changed.
4. Her RDO annotates her Certificate of Registration to list both activities: retail via e-commerce and repair of consumer electronics.
5. Once she receives the updated COR, she starts issuing receipts for repair jobs under the newly listed activity and updates her books of accounts to track the two income streams separately, which matters if one line crosses a VAT threshold before the other.

She pays no separate BIR fee for the update. Her existing TIN, RDO, and Certificate of Registration number do not change — only the list of registered activities on the COR grows by one line.

Frequently asked questions #

Do I need a new TIN to add a new line of business to my BIR registration? #

No. A new line of business added to a registration you already hold does not get a separate Taxpayer Identification Number (TIN). You keep your existing TIN and update your existing registration record to reflect the additional registered activity.

Which BIR form do I use to add a line of business? #

BIR Form 1905, the Application for Registration Information Update/Correction/Cancellation. Part II of the form has a section for changing or adding a registered activity or line of business, separate from the sections for RDO transfer, tax type changes, or lost-document replacement.

Do I need to pay a fee to add a new line of business? #

No separate BIR fee applies. Adding a line of business updates your existing Certificate of Registration rather than creating a new registered location, so the old ₱500 Annual Registration Fee that used to apply per establishment does not apply here — and that fee was abolished for all registered locations under the Ease of Paying Taxes (EOPT) Act effective January 22, 2024 regardless.

Does a new line of business get a new Certificate of Registration number? #

No. The BIR annotates or reissues your existing BIR Form 2303 to list the additional registered activity and its PSIC code. Your original Certificate of Registration number and TIN stay the same.

What happens if I start a second business activity without updating my BIR registration? #

Operating an unregistered line of business under a registration that does not list it exposes you to the general administrative penalty under Section 275 of the NIRC for violating a provision of the Tax Code with no specific penalty of its own — a fine of up to ₱1,000, imprisonment of up to six months, or both — on top of any invoicing or withholding problems that arise from transacting under the wrong registered activity.

Summary #

Adding a second business activity to a BIR registration you already hold is a line-of-business update, not a new registration — file BIR Form 1905 at your current RDO, describe the new activity precisely enough to match a PSIC code, and submit your existing Certificate of Registration for annotation. No new TIN, no new COR number, and no separate registration fee apply. If your new activity is instead at a different physical address, see How to Register a New BIR Branch instead; if you’re updating other registration details like your RDO, see BIR Form 1905: How to Update Your Registration Information or Transfer RDO. Once your updated COR lists the new activity, make sure any BIR Form 2307 you issue or receive for it reflects the correct registered line of business.