Key Takeaways
For readers who want the short version before the detail:
- The costing method is a finance decision that usually gets made in an operations meeting. Most manufacturers should run Standard on produced items and FIFO or Average on purchased components. Decide by item category before go-live, because changing it later is a project, not a setting.
- A standard cost is only as accurate as the BOM and routing behind it. Business Central builds cost from those records. Wrong scrap percentages or run times become wrong margins.
- Overhead sits in two places, and both need an owner. Capacity overhead lives on work and machine centers, and manufacturing overhead lives on the item card. Most drifting unit costs we review have one set and the other forgotten.
- Variances wait for the order to finish. Adjust Cost – Item Entries only settles orders with status Finished. Open orders hide real production cost until someone closes them.
- The flushing method decides what you can see. Automatic flushing posts expected consumption, so scrap can disappear from the numbers entirely.
- Costing is a monthly routine, not a setup task. Finish orders, adjust cost, reconcile WIP and inventory to the G/L, and review standards on a fixed schedule.
Introduction
Most manufacturers moving to Business Central are moving from a system where product cost lived in a spreadsheet. Someone in finance kept a costed BOM in Excel, updated it once a year and used it to set prices. Business Central replaces that spreadsheet with a calculation built from the BOM, the routing, the work centers and the costing method on each item. Set up well, it shows a controller what a production order should have cost, what it did cost and why the two differ. Set up badly, it produces numbers that look precise and aren’t.
This piece is written for the finance side of a manufacturer. It covers which costing method fits which part of a plant, how overhead and variances actually work, how flushing affects what you can see, and the month-end routine that keeps the numbers honest. For a full walkthrough of the manufacturing module, including worked lead-time and variance examples, see our guide to the Business Central manufacturing module.
Lesson 1: The Costing Method Is a Finance Decision Made in an Operations Meeting
In most implementations, the costing method gets chosen during inventory setup by whoever is configuring item cards that week. It’s treated as a field. It’s actually the decision that determines how every unit of inventory is valued, when variances appear and what the CFO sees on the P&L.
Business Central supports five methods. The last column shows where each choice shows up for finance.
| Costing method | How Business Central values the item | Manufacturing fit | What finance sees |
|---|---|---|---|
| Standard | A predetermined unit cost, rolled up from BOM and routing | Produced items with stable BOMs and routings | Variances by cost type when orders finish; stable inventory values |
| FIFO | Actual cost of the earliest receipts still in stock | Purchased raw materials and components | Real purchase cost flows into consumption |
| Average | Weighted average cost over a defined period | Bulk materials with fluctuating prices | Smoothed costs; sensitive to late postings |
| Specific | Actual cost of the exact serial or lot | Make-to-order or high-value serialized items | Exact cost per unit; needs item tracking discipline |
| LIFO | Actual cost of the latest receipts | Rare in manufacturing | Not permitted under IFRS |
The combination we recommend most often is Standard on produced items and FIFO or Average on purchased components. Most of Business Central’s manufacturing costing tools assume Standard, and it gives the controller a benchmark to measure production against. FIFO or Average on components keeps purchase prices real.
The reason this deserves a meeting rather than a default is that the method can’t simply be switched once an item has ledger entries. Changing it generally means new items, moved inventory and rebuilt history. We decide costing method by item category before any item is created, and we put the finance lead in the room for it.
Lesson 2: A Standard Cost Is Only as Good as the BOM and Routing Behind It
Business Central doesn’t expect you to type in a standard cost for a produced item. It calculates one. Calc. Production Std. Cost on the item rolls cost up one level or through every level of the BOM, and the Standard Cost Worksheet does the same for many items at once. The cost is built from these elements:
| Cost element | Where Business Central gets it | Where it goes wrong |
|---|---|---|
| Material | Component quantities on the production BOM, including expected scrap | Scrap percentages copied from an old system and never checked |
| Non-inventory material | Consumables and services on the BOM, only if the setting to include them is turned on | Left off, so consumables never reach product cost |
| Capacity | Routing times × work or machine center rates | Run times from engineering estimates, not the floor |
| Subcontracted | Outside operations costed on the subcontractor’s work center | Subcontractor price changes not updated |
| Capacity overhead | Indirect cost % and overhead rate on work and machine centers | Left at zero because nobody owned the rate |
| Manufacturing overhead | Indirect cost % and overhead rate on the produced item | Set on some items and not others |
Business Central rolls these up through every level of a multi-level BOM, so a subassembly’s cost flows into the finished item. That also means an error at the bottom of a BOM travels to the top.
The most common problem we find isn’t in Business Central at all. It’s a routing that still reflects how the plant used to work: a run time from before a machine was replaced, or a setup time nobody has timed in years. Before any standard cost is implemented, we review the highest-revenue items against what the floor actually spends.
Lesson 3: Overhead Is Where Most Cost Numbers Drift
When a controller tells us the margins in Business Central don’t look right, overhead is the first place we look. Business Central applies it in two separate places, and they do different jobs.
Capacity overhead sits on the work center or machine center as an indirect cost percentage, an overhead rate, or both. A center’s unit cost is its direct unit cost, plus that cost times the indirect cost %, plus the overhead rate. It absorbs costs tied to running that resource: supervision, maintenance, power and depreciation on the machine.
Manufacturing overhead sits on the produced item, set the same way. It absorbs plant-wide costs that aren’t tied to a specific machine, such as facilities, quality and production management.
The mistakes follow a pattern:
- Overhead is set on work centers during implementation and never on item cards, so plant-wide overhead never reaches product cost.
- Similar rates are set on both, so the same cost is absorbed twice.
- Rates are set once from a budget and never compared with what the overhead accounts actually spent.
The test we give clients is simple. Compare the overhead absorbed by production orders last quarter with the overhead you actually spent. If they’re meaningfully apart, the rates need resetting, and every standard cost built on them is off by the same proportion. One reconciled rate is worth more than several precise ones nobody checks.
Lesson 4: Variances Wait for the Order to Finish, and So Does the Surprise
The part of Business Central costing that catches most finance teams off guard is timing. While a production order is open, consumption and capacity post into WIP. Output leaves WIP at standard cost. The difference stays in WIP until the order is set to Finished and Adjust Cost – Item Entries runs. That job only considers finished orders.
Take a simple case. A production order for 200 units has a standard cost of $3,000, but the floor consumes $3,240 of material and capacity. The $240 difference stays in WIP for as long as the order is Released. Once it’s finished and costs are adjusted, Business Central posts the $240 as variances by cost type.
Business Central posts six variance types:
| Variance | What it captures |
|---|---|
| Material | Standard vs. actual component cost consumed |
| Non-inventory material | Standard vs. actual consumables and services, where included |
| Capacity | Standard vs. actual capacity cost |
| Subcontracted | Standard vs. actual subcontracting cost |
| Capacity overhead | Difference in overhead absorbed through work centers |
| Manufacturing overhead | Difference in overhead absorbed through the item |
The material variance line generates the most questions. It can combine two different problems: more material used than planned, and material bought at a different price. Whether the price difference appears there depends on how the component itself is costed. If a component is on Standard, its price difference posts as a purchase variance when it’s received, so the production order’s material variance reflects usage. If the component is on FIFO or Average, the actual price travels into the production order. That’s one more reason to decide costing method by item category in Lesson 1.
The second problem is open orders. A plant that finishes production orders whenever someone remembers carries real variances in WIP for weeks. The month looks clean and the next one absorbs the problem. Finishing physically complete orders before month-end is the single habit that most improves the accuracy of the numbers.
Two recent changes help. Since April 2025, a finished order can be reopened once to fix missing consumption or tracking, so finishing promptly carries less risk. Since April 2026, capacity and overhead post to the WIP account of the production location, which makes multi-site costing cleaner.
Lesson 5: The Flushing Method Decides How Honest Your WIP Is
Flushing is how Business Central records component consumption. It has a bigger effect on cost reporting than most finance teams expect. There are six methods:
| Flushing method | When consumption posts | What it means for costing |
|---|---|---|
| Manual | When someone posts a journal | Accurate if done; WIP is understated if not |
| Forward | At release, for the expected quantity | WIP fills immediately; real scrap isn’t captured |
| Backward | At finish, based on actual output | Little floor effort; usage beyond the BOM can go unseen |
| Pick + Forward | Like Forward, after a warehouse pick | Matches physical movement; needs warehouse discipline |
| Pick + Backward | Like Backward, after a warehouse pick | Same |
| Pick + Manual | Manual posting that requires a pick | Most control; most effort |
Microsoft itself warns that with automatic flushing you might not accurately record, or even be aware of, scrap. For finance, that means a material variance can read close to zero while the inventory count drifts short.
Our advice is to flush per component, not per company. Use automatic flushing for low-value, high-volume parts like fasteners and packaging. Use manual or pick-based flushing for expensive, tracked or scrap-prone materials. That keeps the floor fast and the costly variances visible.
Lesson 6: Costing Is a Monthly Routine, Not a Setup Task
The manufacturers whose numbers we trust in Business Central aren’t the ones with the most elaborate setup. They’re the ones with a fixed routine. This is the month-end sequence we recommend:
- Post all remaining output, consumption and capacity for the period.
- Finish every production order that’s physically complete.
- Run Adjust Cost – Item Entries, or confirm automatic cost adjustment has caught up.
- Post inventory cost to the G/L if automatic cost posting isn’t enabled.
- Reconcile the inventory and WIP G/L accounts against the inventory valuation reports.
- Review the period’s variances by type, then the orders that drove them.
On top of that comes a regular standard cost review in the Standard Cost Worksheet:
- Purchasing suggests new component costs.
- Production suggests new work and machine center rates.
- Finance rolls up the changes, reviews the impact and implements them on a chosen date.
- Business Central then creates revaluation lines for stock already on hand.
The step people skip is posting that revaluation. Without it, item cards show the new standard while inventory stays at the old one.
Book a Free Consultation
If you’re implementing Business Central, or you’re live and the margins don’t look right, a costing review is a useful next step. Bring your costing method by item category, a BOM and routing for one of your top products, and last quarter’s variance and overhead figures. We’ll show you where the cost calculation is drifting, which settings to change and what a month-end routine should look like for your plant.
Folio3 Dynamics is a Microsoft Solutions Partner with 20+ years of Dynamics delivery, 200+ Microsoft-certified experts and 300+ projects across four continents. We implement Business Central for discrete, process and mixed-mode manufacturers.
with the Folio3 team.
Frequently Asked Questions
How does Business Central help with manufacturing costs?
Business Central calculates a produced item’s cost from its production BOM, routing, work center rates and overhead settings. It then compares that standard with what each production order actually consumed. When the order is finished and costs are adjusted, it posts the difference as variances by cost type, so finance can see where production spent more or less than planned.
Which costing method should a manufacturer use in Business Central?
Most manufacturers use Standard for produced items and FIFO or Average for purchased components. Standard gives a benchmark for variance reporting, and most of the manufacturing costing tools assume it. Specific costing suits make-to-order or serialized products where each unit’s cost matters.
When does Business Central post production variances?
When the production order is set to Finished and Adjust Cost – Item Entries runs. Until then, the difference between actual and standard cost sits in WIP, so orders left open past month-end delay variances into a later period.
How is overhead applied in Business Central manufacturing?
In two places. Capacity overhead is set on work and machine centers as an indirect cost percentage and/or overhead rate. Manufacturing overhead is set on the produced item the same way. Both roll into the standard cost and both post their own variance.
Can I change an item’s costing method in Business Central?
Not simply, once the item has ledger entries. A change generally means setting up a new item with the new method and moving inventory to it. That’s why the decision should be made by item category before go-live.
Do I need Business Central Premium for manufacturing costing?
Yes. Manufacturing is available only with Premium, which lists at $110 per user per month against $80 for Essentials.