Here’s a practical, lawyerly guide to the question:

Is There a Fee for Requesting a Duplicate Receipt? (Philippine context)

Short answer

Private businesses: There is no uniform, government-mandated fee for giving a customer a duplicate/reprint/certified copy of a receipt. A business may charge a reasonable administrative/retrieval/printing fee. If they charge anything, they must issue an official receipt for that fee and treat it like any other income (VAT or percentage tax applies depending on their registration).
Government offices: If the receipt you want is from a government agency (e.g., city hall, LTO, BIR payment), agencies typically have published certification/reprinting fees. Often a small certification fee is charged and, for certifications, an additional documentary stamp tax (DST) on “certificates” may be collected. Exact amounts vary by agency and local ordinance.

What counts as a “duplicate receipt”?

Manual receipts/invoices: Pre-printed booklets usually have multiple copies (original for the buyer; duplicates/triplicates retained by the seller). The duplicate is part of the seller’s records; customers don’t get the original duplicate sheet. Instead, businesses usually provide a photocopy or scanned copy of their retained copy, typically marked “Certified True Copy”.
POS / register receipts: Stores can often reprint the slip from their system if the transaction is recent; older transactions require back-office retrieval (hence possible admin fees).
Electronic receipts/invoices: The seller can re-email or reprint a PDF/e-OR/e-invoice. Businesses still keep their own electronic record.

Note: You’re not asking for a new original. You’re asking for a copy (reprint or certified true copy) of what already exists in the seller’s records.

Legal backdrop (in plain English)

Businesses are required to issue receipts/invoices for sales and to keep their copies for tax audit purposes (commonly years, often up to a decade).
There’s no statute that sets a standard price for giving customers a later copy.
If a fee is collected for the duplicate/certification, it’s a taxable receipt and the business must issue an official receipt for that payment.
Consumer protection: Charges must not be deceptive or unconscionable. If a fee looks abusive (e.g., wildly disproportionate to a simple photocopy), you can complain to DTI or your local consumer office.
Data privacy: Businesses should verify identity/authority before releasing a copy that may contain personal or sensitive information (e.g., name, address, TIN). Expect to present an ID or authorization if you’re a representative.

When do fees usually appear?

Scenario	What you typically get	Why a fee might be charged	Notes
Retail store POS slip from last few days	On-the-spot reprint	Minimal/none	Some stores don’t charge if it’s quick.
Old POS slip (weeks/months old)	Reprint or certified copy from back-office	Retrieval/processing	Reasonable “research/printing” fee is common.
Professional fees (clinic, school, services)	Certified true copy of OR	Admin + certification	Fees vary by internal policy.
Company-to-company transactions	Certified true copy of OR/SI	Admin; sometimes notarization if requested	Firms often ask for Authorization Letter on letterhead.
Government-issued OR (e.g., city hall)	Certified copy/reprint + certification	Agency’s schedule of fees + possible DST on the certification	Amount is set by the agency/ordinance.

Are businesses required to give you a copy?

There’s no blanket rule forcing a private seller to release their internal duplicate sheet.
In practice, most will cooperate by giving a reprint or certified copy (because customers need it for warranty, liquidation, insurance, or tax substantiation).
If the transaction is very old or records were purged, they may genuinely be unable to produce it.

What they may require from you

Transaction details: date, amount, last 4 digits of card used, branch, receipt/OR number, item purchased.
Identity/authority: valid ID. If you’re a representative, an Authorization Letter (or Board Resolution/SPA for corporations) plus IDs.
Affidavit of loss: Sometimes requested if the original OR is lost and you need a certified copy for formal purposes (e.g., warranty, audit).
Payment of fees (if any): Ask for an official receipt for whatever you pay.

Taxes & accounting effects (why the form matters)

Reimbursements/liquidations: Many companies accept a certified true copy + affidavit of loss if the original is gone; check your internal policy.
VAT input tax: The original VAT invoice/OR is the gold standard. If lost, keep an affidavit of loss and obtain a certified true copy. Acceptance in audit is case-by-case; more documentation improves your position.
Duplicate-copy fee: If a seller charges you ₱X for retrieval/certification, that ₱X is income to the seller and they should give you an official receipt for it.

Practical tips to avoid or minimize fees

Act quickly. POS reprints are easiest soon after the sale.
Bring alt-proof: screenshots of e-mail confirmations, bank/GCash statement showing the charge, loyalty card number—these speed up lookup.
Ask for a simple reprint (if that’s enough for your purpose) instead of a formal certification.
Clarify the fee upfront and request an OR for it.
For government receipts, check the agency’s website or bulletin for the official schedule of fees (and whether a DST stamp is required for certifications).

Can they refuse or overcharge?

Businesses may refuse if they can’t verify your identity/authority, or records are unavailable.
Excessive fees can be challenged under consumer protection norms. For essential documentation (e.g., to honor a warranty), an unreasonable fee used to frustrate a lawful claim can draw regulatory attention. You can escalate to a DTI office or local Business Permits & Licensing office for mediation.

How to ask for a duplicate (templates)

A. Simple request e-mail/letter (private business)

Subject: Request for Duplicate/Certified Copy of Receipt

Dear [Store/Company Name],

I would like to request a [reprint/certified true copy] of the receipt for a purchase made on [date] at your [branch]. Details:

• Amount: ₱[amount]
• Mode of payment: [cash/card/bank transfer]
• Items/Service: [brief description]
• Receipt/OR No. (if known): [number]

I am [the purchaser / authorized representative of (Company Name)], and I have attached a [valid ID / authorization letter + ID]. 
If there are administrative fees, kindly advise the amount and payment method. Please also issue an official receipt for any fee collected.

Thank you,
[Name, contact number]

B. Authorization letter (individual → representative)

To whom it may concern:

I, [Full Name], authorize [Representative’s Full Name] to request and receive the [reprint/certified copy] of the receipt covering my purchase on [date] at [branch]. 
Attached are copies of my valid ID and my representative’s ID.

Signed:
[Name, signature, date]

C. Affidavit of Loss (outline for notary)

Your name and ID details
Description of the original receipt (date, amount, OR/SI no., seller, branch)
Facts of loss/misplacement (when/how discovered)
Statement that the document has not been pledged/assigned and will be surrendered if found
Purpose of securing a certified copy (e.g., liquidation/warranty/audit)

(Bring this outline to a notary public to prepare and notarize a formal affidavit.)

Bottom line

There is no fixed, across-the-board fee in the Philippines for a duplicate receipt request.
Private sellers may charge a reasonable admin fee and must receipt it.
Government offices follow their official fee schedules (often with certification fees and possible DST).
Bring proper IDs, authorizations, and transaction details to speed things up—and ask for the OR for whatever fee you pay.

This is general information, not legal advice. If your situation involves a large tax claim, audit exposure, or a government contract, consider consulting a Philippine lawyer or tax professional for specific guidance.