Solo Biz VAT Auto-Classifier

3.60

Derivation Chain

Step 1 Solo business Tax Accounting & Labor automation

→

Step 2 Purchase/sales classification for VAT filing

→

Step 3 Simplified ↔ general taxation transition timing optimization

Problem

Self-employed individuals in their 50s who transitioned to running a solo cafe, online selling, or freelancing after retirement must file VAT returns every quarter. They struggle to distinguish which business card transactions qualify for input tax deductions (ingredients, office supplies) versus those that don't (entertainment, personal expenses). Hiring a tax accountant costs 110,000–220,000 KRW (~$82–$165) per month, which amounts to 10–20% of net profit for micro-businesses earning under 2 million KRW (~$1,500) per month.

Solution

Users upload their business card transaction history (Excel/CSV) downloaded from HomeTax, and the system automatically classifies each transaction as deductible or non-deductible for input VAT. It then generates a draft VAT return (sales, purchases, tax payable). For businesses near the simplified taxation threshold, it provides transition timing strategies such as: 'Based on your sales trend this year, you're projected to switch to general taxation — increasing inventory purchases before the transition can maximize your deductions.'

Target: Solo Entrepreneurs aged 50–60 (cafe owners, online sellers, freelancers) who transitioned after retirement, with annual revenue under 48 million KRW (~$36,000), seeking to self-file because tax accountant fees are burdensome

Revenue Model: Quarterly VAT classification is Free. Draft VAT return + transition strategy Report: 9,900 KRW (~$7.40) per quarter. Future potential for tax accountant referral partnerships.

Ecosystem Role: Supplier

MVP Estimate: 2_weeks

NUMR-V Scores

N Novelty

2.0/5

U Urgency

5.0/5

M Market

4.0/5

R Realizability

4.0/5

V Validation

3.0/5

NUMR-V Scoring System

N Novelty	1-5	How uncommon the service is in market context.
U Urgency	1-5	How urgently users need this problem solved now.
M Market	1-5	Market size and growth potential from proxy indicators.
R Realizability	1-5	Buildability for a small team with realistic constraints.
V Validation	1-5	Validation signal quality from competition and demand data.

SaaS N=.15 U=.20 M=.15 R=.30 V=.20 Senior N=.25 U=.25 M=.05 R=.30 V=.15

Feasibility (76%)

Tech Complexity

34.7/40

Data Availability

20.8/25

MVP Timeline

20.0/20

API Bonus

0.0/15

Feasibility Breakdown

Tech Complexity	/ 40	Difficulty of core implementation stack.
Data Availability	/ 25	Practical availability and cost of required data.
MVP Timeline	/ 20	Expected time to ship a usable MVP.
API Bonus	/ 15	Bonus for viable public API leverage.

Market Validation (60/100)

Competition

8.0/20

Market Demand

6.2/20

Timing

16.0/20

Revenue Signals

10.5/15

Pick-Axe Fit

12.0/15

Solo Buildability

7.0/10

Validation Breakdown

Competition	/ 20	Signal quality from competitor landscape.
Market Demand	/ 20	Demand proxies from search and mention patterns.
Timing	/ 20	Fit with current shifts in tech, behavior, and regulation.
Revenue Signals	/ 15	Reference evidence for monetization viability.
Pick-Axe Fit	/ 15	How well the concept serves participants in a trend.
Solo Buildability	/ 10	Practicality for lean-team implementation.

Technical Requirements

Frontend [low] Backend [medium] Data Pipeline [low]

Dashboard