Role

Planning · Design · Development (solo)

Web App · Tax Calculation · Filing Prep

Team

Solo development

Platforms

Web

Date

Mar 2026 - Present

Overview

Complicated tax-filing prep, all in one place

When you work as a freelancer or sole proprietor in the Philippines, you have to handle your own BIR (Bureau of Internal Revenue) tax filing—and keeping up with everything on your own, from choosing a taxation method to quarterly deadlines and filing forms, is no easy task.

Tax Assistant PH is a tool that helps freelancers and self-employed individuals organize their day-to-day tax tasks and prepare their filings.

This tool is a support tool that helps with tax calculations, and it is not official tax advice. The final filing and review are up to you or a tax professional (CPA).

What it does for you

• Tax calculator — Shows the 8% flat rate and the graduated rate, the two taxation methods, side by side for comparison. (For reference.)
• Income · expense tracking — Records income and expenses along with receipt numbers, and converts foreign-currency income into pesos to keep it organized.
• BIR deadline calendar — Automatically surfaces quarterly and annual filing deadlines, and, if you like, sends you an email reminder in advance.
• Filing form helper — Walks you through commonly used BIR filing forms step by step, fills in a draft with your recorded data, and lets you download it as a PDF.
• Reports — Lets you generate a quarterly profit-and-loss summary, a CSV, and a quarterly PDF for submission to a professional.

What I focused on most while building it

• Something you can follow on your own — I kept the flow as simple as possible so that even people unfamiliar with tax terms and procedures can follow along step by step and prepare.
• Not missing things — Since the most common difficulty is “missing a deadline,” I paid special attention to deadline reminders.
• “Organizing,” not “judging” — Rather than declaring what’s correct, it gathers the necessary information and presents it for comparison, leaving the choice to the user (or a professional).

Stack

• Front: Next.js (App Router), React, TypeScript, Tailwind CSS, shadcn/ui
• Backend: Supabase (Postgres + Auth + Storage)
• Email: Brevo (deadline reminders)
• Documents: PDF generation (jsPDF)
• Other: Forms · validation (react-hook-form, zod), charts (recharts)
• Key screens: Tax calculator, income/expense tracking, deadline calendar, filing form helper, reports

Now, and what’s next

I’m refining it with the goal of cutting down the time freelancers spend preparing their tax filings.

To take a look for yourself, head here: t-assist-seven.vercel.app