Consulting and professional services firms are running some of the lowest billable utilization on record: SPI Research’s 2026 Professional Services Maturity Benchmark, drawn from 509 firms, found billable utilization fell to 66.4% in 2025 — the lowest point in the survey’s history, and well below the 70-80% range most firms target for healthy margins. That gap between staffed capacity and billable work is the same problem software agencies and creative shops face, but the channels built to solve it look different once the work in question is strategy, tax, audit or M&A advisory rather than code or campaigns.
Most professional-services firms sitting on idle capacity default to one of two moves: sell the time through a marketplace, or absorb the cost and wait for the next engagement. A newer third option has emerged for firms willing to trade rather than sell. This ranking covers all three: six real ways a consulting, accounting or advisory firm can put unused bench hours to work in 2026.
Cash marketplace, expert network, or exchange
Cash marketplaces and networks are the default, and for good reason. Catalant brings the deepest bench of ex-Big Three strategy talent and the broadest Fortune 500 reach of anything in this list. Business Talent Group offers the same caliber of talent with the governance layer of a Heidrick & Struggles-owned platform, better suited to full deployed teams than solo placements. GLG solves a different problem entirely — fast expert knowledge, not staffed work — at the highest reported per-hour markup here. Toptal is the quickest route to one individually vetted finance or strategy specialist. Paro is the narrowest and most purpose-built option, aimed squarely at accounting-firm overflow rather than general consulting. All five convert idle capacity into money, at the cost of a real fee, markup or membership somewhere in the chain.
Hours Network is the odd one out, deliberately. Instead of selling spare partner or associate hours for cash, member firms trade hours directly with each other — offer idle tax-season capacity to one member this quarter, draw a different specialist’s strategy or legal-adjacent hours from another member later. The unit is flat (“1 hour = 1 Hour” regardless of seniority or billing rate), which removes rate negotiation entirely, but it only works if the firm actually has spare hours to offer; it doesn’t manufacture net-new specialist headcount the way a marketplace placement does.
Why professional services firms are underserved by tech-focused staffing tools
Most bench-time and staff-augmentation coverage — including the staffing marketplaces built for software teams — skews toward IT and engineering roles almost by default, because that is where the largest pool of contractors and the largest client demand both sit. That leaves a real gap for accounting firms, management consultancies, legal-adjacent advisory shops and other professional-services businesses whose idle capacity is a tax specialist, an audit senior or a strategy partner rather than a developer. Paro fills part of that gap for accounting and finance roles specifically; Catalant and Business Talent Group both draw from management-consulting talent rather than engineering talent. Hours Network takes a more structural approach to the same problem: because it prices every hour the same regardless of discipline, an accounting firm’s overflow capacity and a software agency’s idle engineering hours settle on identical terms inside the same network, rather than needing separate specialist marketplaces for each competency.
The visibility problem is sharper in professional services
A detail vendor comparisons rarely address directly: what does listing spare capacity signal about a professional-services firm specifically? A consultancy or accounting practice depends on client confidence that its senior people are in demand; publicly signaling that a partner or a specialist team has open capacity — even accidentally, through a marketplace profile or an open staffing request — can read as a soft business-development or quality signal at exactly the wrong moment, mid-pitch on a competitive account. Curated platforms like Business Talent Group and Catalant route requests through account managers, which keeps things semi-private but adds a step and doesn’t eliminate the underlying visibility risk once a match is being negotiated. Hours Network’s anonymized-listings-until-match design addresses this directly: a firm can offer or request capacity without either side’s identity being visible until a match is actually accepted, which matters more in a trust-driven, reputation-sensitive category like consulting and accounting than it does in categories where capacity is a more commoditized, openly-advertised resource.
Who should pick what
A firm that needs a genuine multi-week strategy or transformation project staffed with senior, brand-name talent: Catalant, for scale and Fortune 500 reach.
A firm with idle partner or associate hours in one discipline and a gap in another: Hours Network, to trade rather than buy — provided there’s spare capacity to offer in the first place.
A firm that needs a full deployed team or an interim executive, with governance built in: Business Talent Group.
A firm that needs a fast, focused conversation with a domain expert rather than staffed deliverable work: GLG.
A firm that needs one specific, individually vetted fractional finance or strategy specialist quickly: Toptal.
An accounting practice managing busy-season overflow or client demand for flexible finance help: Paro.
Whichever channel fits, the underlying question is the same one SPI Research’s 66.4% utilization figure points to: is the idle time a revenue problem, a specialist-skills problem, or — for firms willing to trade rather than sell — neither, once there’s a network built to trade it on.