How to Build a Business Case for Reshoring a Mid-Volume Assembly Line

Reshoring a mid-volume assembly line requires more than a comparison between offshore labour and an Australian wage. The decision must survive the economics of a line making thousands rather than millions of units, often with product variety, frequent changeovers and uneven demand. A credible business case isolates avoidable offshore costs, tests operating assumptions and identifies the volume at which local production earns an acceptable return.

Tooling, certification, supplier qualification, training, start-up losses and working capital all affect the result. Shorter lead times also need a financial mechanism, such as lower pipeline inventory, fewer rush shipments or service failures that a customer will pay to avoid. Benefits without an owner and supporting evidence should stay outside the financial case.

Australia adds currency and customs variables that can move the answer. Imports generally attract 10% GST, with eligible businesses claiming input credits, while customs duty depends on tariff classification and origin. Importers need accurate documentation through an accredited customs broker, especially when claiming preferential tariff treatment. For buyers in Melbourne, industrial rents and congested road freight can erode wage savings; a regional site near Adelaide may lower property costs while changing access to labour and logistics.

Define the decision and the baseline

Begin with a make-or-buy decision that specifies what moves: assembly, subassembly, testing, packaging or a complete product line. Relocation, new capacity and dual sourcing have different capital requirements and risks. The baseline should be the most likely operating alternative, including retained offshore capacity and realistic exit costs, rather than an artificially weak no-change scenario.

Map the current value stream before quoting the new one. Record cycle times, changeover losses, scrap and rework, bottlenecks, minimum economic batch sizes and seasonal peaks. Translate those conditions into a line balance for Australian production, then compare it with the offshore flow. A faster cycle has little value if supplier variability, inspection delays or a missing component stops the line.

Set the scope before testing returns: planning horizon, currencies, discount rate, tax treatment, volume range and decision gates. Use evidence from current orders, written supplier quotations, wage agreements and utility tariffs. A supplier letter of intent can support a launch plan; it is not equivalent to a firm price or guaranteed capacity.

Build a transparent cost baseline

Calculate the current total landed cost per unit, not the factory invoice. Include international freight, insurance, duty, customs brokerage, port handling, inland transport and stock carrying cost. Track GST as a cash-timing item where it is recoverable rather than treating it as a permanent cost. Door-to-door logistics can add materially to the cost of bringing goods to a warehouse in Melbourne or Perth.

Price the local alternative with comparable definitions. Add direct labour, supervision, energy, maintenance, consumables, quality assurance, facility cost, depreciation and overheads that genuinely change with the decision. Keep sunk costs separate, but include incremental fixed costs. A corporate allocation may describe management accounting without revealing whether the new line improves cash generation.

Avoid replacing all offshore cost with all onshore cost. Imported components, tooling and equipment can remain substantial even after final assembly returns. Model the origin of each item and the effect of tariffs on those inputs. If customers or grant programs attach local-content rules, test eligibility rather than assuming that an Australian address makes the product fully local.

Quantify operating and supply-chain value

Treat working capital as a cash benefit only when the operating plan releases stock. Shorter replenishment lead times can reduce pipeline inventory, but that depends on forecast accuracy, supplier discipline and a stable production schedule. Discount obsolete or excess stock separately. Receivables, supplier terms and commissioning cash requirements often offset a large part of the inventory saving.

Assign a price to response, not an aspiration. If an Australian customer loses production because of a delivery delay, quantify the documented downtime or expedite cost and determine whether the new line can prevent it. Faster delivery can support new orders, but only incremental volume with contribution margin belongs in the cash flow. Treat export and ANZ opportunities separately, with realistic sales costs and capacity requirements.

Plan the ramp-up and steady state. A mid-volume line needs time for recruitment, training, first-pass yield and process capability to settle. Build a learning-curve assumption, then test higher demand against machine availability, supplier capacity and changeover time. Buffer stock and a second source for critical parts may increase cost, yet they can be cheaper than the downtime they prevent.

Test cash flow, risk and timing

Model capital expenditure, commissioning, training, duplicated inventory and supplier development as dated cash flows. Include tax, depreciation, working-capital movements and exit costs for the displaced operation. If that operation is in Australia, award obligations and genuine redundancy consultation belong in the transition budget. Remove stranded assets and one-off tax effects from operating assumptions.

Apply the company’s hurdle rate and calculate net present value and internal rate of return over the asset’s useful life. Then run a sensitivity analysis on volume, utilisation, yield, labour availability, energy, supplier prices and Australian dollar movements against supplier currencies. Add stress cases for tariff changes, an offshore contract termination, delayed commissioning or a customer postponing an order. Mitigations need costs and owners; dual sourcing without an approved supplier is not a mitigation.

Phase the investment around evidence. A short pilot, staged tooling release or defined output from the existing line can expose process problems before the full capital commitment. Put a hold point before each major spend, with thresholds for demand, quality and supplier performance. This gives management a real decision rather than a forecast that merely confirms the preferred answer.

Make the case usable across the business

Present the base case alongside upside and downside scenarios. Give every material assumption an owner and a source, and separate verified facts from negotiated estimates and aspirational targets. Keep non-financial benefits visible, including workforce capability and supply-chain resilience, but do not disguise them as cash savings. The commercial argument strengthens when those benefits connect to a specific operating decision.

A business case is also a commercial instrument. Operations can use it to justify tooling and capacity commitments; procurement can use supplier evidence to negotiate; customer teams can connect lead-time promises to willingness to pay. For Australian industrial suppliers, it can support discussions about localisation and local content. It cannot substitute for approved capacity, qualified suppliers or an order book.

A defensible recommendation may be to stage the move, retain a second source or stop before committing capital. Financial discipline is more valuable than a predetermined reshoring narrative. Approval thresholds should be set in advance so demand or cost changes trigger a revised decision rather than a quiet reset of the model.

Start with the evidence that can change the decision. The immediate next step is a two-hour assumptions workshop with finance, operations, procurement and the line supervisor to agree the baseline landed-cost model, break-even output and evidence gaps.