
The 4-5-4 Retail Calendar, Explained: Why Retailers Count Months in Whole Weeks
The 4-5-4 calendar divides each quarter into 4-, 5-, and 4-week months so every period holds whole weekends — plus a 53rd week every five to six years.
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Accounting solutions for online stores and e-commerce businesses

The 4-5-4 calendar divides each quarter into 4-, 5-, and 4-week months so every period holds whole weekends — plus a 53rd week every five to six years.

Dynamic pricing moves prices with demand, inventory, and competitors — set cost floors, price the market not the shopper, and reconcile every payout.

Below $30k/mo in US sales, TaxJar or Stripe Tax wins; above it, flat-rate Anrok or Avalara cost less — pricing, filing, and certificates compared.

A loss leader sells below cost to win the trip — the basket it pulls in must cover the subsidy, or the loss never comes back.

Charm prices exploit the left-digit effect, anchors set the reference, and decoys steer tier choice — six tactics with the research behind each.

Stripe is cheaper online (2.9% + 30¢); Square wins in person (2.6% + 15¢) with next-day payouts, free POS, and no dispute fee.

Stripe is cheapest online at 2.9% + 30¢, Square wins in person with free POS and next-day payouts, and PayPal costs most but converts best.

Exclusive territory, purchase quotas, MAP pricing, trademark control, and sell-off rights decide who bears the cost when a distribution relationship ends.

Duties and freight are inventory cost, not expenses — capitalize them per SKU, reconcile payouts gross-to-net, and accrue uninvoiced fulfillment monthly.

Shopify payouts are net settlements, not revenue — book gross sales, split every fee, and stage chargebacks; your 1099-K reports the gross to the IRS.

Shopify labels bill separately from payouts — split each invoice, book postage to COGS, and remit sales tax collected on shipping.

When an online seller charges no sales tax, you owe use tax to your state at your local rate. Here is how to self-accrue it each month.