C-Corp Tax Kit
Delaware Franchise Taxcritical

Default uses Authorized Shares Method with 10M shares = $75,000+. File with Assumed Par Value Capital Method instead.

Authorized Shares
$75k→~$400
6 Modules
Critical Checks0/3
Entity & Stock0/4
Team Questions0/3
+3 more: Nexus, Financial, Atlas Docs
83(b) Election Proofcritical

Require stamped form or certified mail receipt from each founder. Without proof, the individual is liable for tax on share vesting.

F1
F2
F3
3 founders must upload proof
State Nexus
DE
Incorporation
WI
Foreign corp needed
IL
Foreign corp needed
Based on equity holder work locations
FinCEN BOI Reportcritical

Beneficial Ownership Information report required within 90 days of incorporation. Separate from taxes.

Late penalty$500/day
Entity & Stock
Authorized Shares10,000,000
Issued Shares~4-5M
Fiscal YearCalendar (Dec 31)
REST API11 routes
GET/api/checklist/items
PATCH/items/{id}
GET/api/checklist/team
PUT/responses/{m}/{i}
POST/api/checklist/upload
Financial Module
Gross Assets (Schedule L)
Startup Cost Documentation
Balance Sheet Preparation
Feeds into Delaware Assumed Par Value calc
Team Questionsper equity holder
83(b) proof uploaded?critical
Work locations listed?critical
Out-of-pocket expenses?high
Atlas Doc Map
Certificate of Incorporation
Stock Purchase Agreement
Vesting Schedules
RSA Agreements
CIIAA (IP Assignment)
Storage
In-Memory
Default, zero config
Vercel Blob
Set BLOB_READ_WRITE_TOKEN
Tech Stack
Next.js 16React 19TypeScriptTailwind v4shadcn/uiSWRLucide
Delaware Franchise Taxcritical

Default uses Authorized Shares Method with 10M shares = $75,000+. File with Assumed Par Value Capital Method instead.

Authorized Shares
$75k→~$400
6 Modules
Critical Checks0/3
Entity & Stock0/4
Team Questions0/3
+3 more: Nexus, Financial, Atlas Docs
83(b) Election Proofcritical

Require stamped form or certified mail receipt from each founder. Without proof, the individual is liable for tax on share vesting.

F1
F2
F3
3 founders must upload proof
State Nexus
DE
Incorporation
WI
Foreign corp needed
IL
Foreign corp needed
Based on equity holder work locations
FinCEN BOI Reportcritical

Beneficial Ownership Information report required within 90 days of incorporation. Separate from taxes.

Late penalty$500/day
Entity & Stock
Authorized Shares10,000,000
Issued Shares~4-5M
Fiscal YearCalendar (Dec 31)
REST API11 routes
GET/api/checklist/items
PATCH/items/{id}
GET/api/checklist/team
PUT/responses/{m}/{i}
POST/api/checklist/upload
Financial Module
Gross Assets (Schedule L)
Startup Cost Documentation
Balance Sheet Preparation
Feeds into Delaware Assumed Par Value calc
Team Questionsper equity holder
83(b) proof uploaded?critical
Work locations listed?critical
Out-of-pocket expenses?high
Atlas Doc Map
Certificate of Incorporation
Stock Purchase Agreement
Vesting Schedules
RSA Agreements
CIIAA (IP Assignment)
Storage
In-Memory
Default, zero config
Vercel Blob
Set BLOB_READ_WRITE_TOKEN
Tech Stack
Next.js 16React 19TypeScriptTailwind v4shadcn/uiSWRLucide
Next.js 16 Starter Kit

Ship your first C-Corp compliance season without the $75k surprise

A ready-to-fork compliance tracker for Delaware C-Corps incorporated via Stripe Atlas. Covers Delaware Franchise Tax, state nexus, 83(b) elections, FinCEN BOI, and the Stripe Atlas document map. In-memory storage by default, Vercel Blob when you need it.

Phase 0
3 critical
Critical Checks
Where You Might Get Burned
0 / 3
All18
In Progress
Completed
Phase 1
Entity & Stock Module
Cap table, authorized vs. issued shares
2 / 4
Open full-size

What's in the box

Each module is a separate component with its own API routes. Swap, extend, or remove any piece.

Critical Checks Module
Delaware Franchise Tax gotchas, state nexus traps, and FinCEN BOI deadlines. Each item includes warning, why-it-matters, and action-required callouts, color-coded by priority level.
Entity & Stock Tracker
Authorized vs. issued share counts, EIN verification, fiscal year confirmation. Each item links to the specific Stripe Atlas document and section where you find the answer.
Team Questions System
Collect per-person responses from equity holders. 83(b) election proof, physical locations, and out-of-pocket expenses with upload support.
Nexus Checklist
Guides you through collecting physical work locations from each equity holder and flagging states that require foreign corporation registration.
Financial Module
Gross assets for Schedule L, startup cost documentation, and balance sheet preparation. Collects the numbers your CPA needs for the Delaware Assumed Par Value calculation.
Stripe Atlas Doc Map
A dedicated reference category that maps each data point to the exact Stripe Atlas document: Certificate of Incorporation, Stock Purchase Agreements, Vesting, RSAs, and CIIAAs.
Storage Abstraction Layer
In-memory by default, swappable to Vercel Blob with one environment variable. All API routes use a unified storage interface for reads and writes.
File Upload Pipeline
Upload 83(b) proofs, balance sheets, and registration documents per item or per team member. Stores to Blob when enabled, memory otherwise.
20
Checklist Items
6
Compliance Modules
11
API Routes

Tech stack

Pulled from package.json. No hidden dependencies.

Next.js 16React 19TypeScriptTailwind CSS v4shadcn/uiSWRLucide IconsVercel Blob (optional)

REST API

11 route files exposing GET, POST, PUT, PATCH, and DELETE across items, categories, team members, responses, uploads, and seed data. Sample endpoints below.

GET/api/checklist/items
PATCH/api/checklist/items/{id}
GET/api/checklist/categories
GET/api/checklist/team
PUT/api/checklist/responses/{mid}/{iid}
POST/api/checklist/upload
POST/api/checklist/seed

Built-in compliance warnings

Critical and high-priority items ship with pre-written warning copy, explanation of impact, and specific remediation steps. Here are three examples from the seed data.

Delaware Franchise Tax
Default calculation uses Authorized Shares Method with 10M shares = $75,000+. Kit guides user to file with Assumed Par Value Capital Method = ~$400.
State Nexus Trap
Founders working from home in any state outside Delaware creates nexus. Kit tracks per-person locations and flags states requiring foreign corp registration.
83(b) Election Proof
Kit requires upload of stamped form or certified mail receipt. Missing proof = founder personally liable for tax on share vesting.

Explore

Browse the live app and download brand assets.

Live Demo
Open the compliance tracker with seed data and interact with the full checklist, status filters, and expandable items.
Brand Assets
Download SVG icons, favicons, and OpenGraph images for your deployment.