This report assessed the lifetime costs and benefits of providing early access to British Sign Language (BSL) for deaf children. Using literature review and economic modelling, results showed a strong return – each £1 invested yielded over £2 in benefits. Early BSL prevents language deprivation, enhances education and employment outcomes, and supports inclusion, making it a strong investment in human capital.

The value of British Sign Language

An economic analysis

Marco Hafner, Daniel Lee, Katie Sykes, Erez Yerushalmi

ResearchPublished Nov 18, 2025

More than 430 million people worldwide – including 34 million children – live with disabling hearing loss, facing persistent barriers to education, employment and social participation. In the UK, around 1-2 in every 1,000 children are born deaf, most to hearing parents with little experience of deafness. Although early screening enables rapid diagnosis, many children still face language deprivation if hearing technologies alone do not provide full or delayed access to spoken language. British Sign Language (BSL), legally recognised in 2022, offers a route to early language acquisition, yet only around 9% of deaf children use BSL in school, and its economic value remains poorly understood.

The British Deaf Association commissioned RAND Europe to assess the lifetime costs and benefits of providing early access to BSL (birth to age five). The study combined a targeted literature review with economic modelling to estimate how early BSL exposure affects outcomes in education, employment, health, and wellbeing. Two scenarios were analysed: (1) BSL as a standalone intervention and (2) BSL alongside hearing technologies for children at risk of incomplete language acquisition.

Results show that early BSL access represents a strong investment in human capital. In the base case, every £1 invested generated more than £2 in benefits (Benefit-Cost Ratio 2.34 over 80 years). Even under pessimistic assumptions, around half of costs were recouped, while optimistic assumptions yielded up to £16 per £1 invested. The findings highlight BSL’s role in preventing language deprivation and support its inclusion in early intervention pathways for deaf children.

Key Findings

Early-years BSL acquisition can have positive economic returns as a stand alone intervention

  • In the base case, the BCR was 2.34 over an 80-year horizon and 2.04 over 50 years, meaning every £1 invested could generate more than £2 in benefits. Even under pessimistic assumptions, around half of the investment could be recouped (£0.44 over 50 years, £0.51 over 80 years). Under optimistic assumptions, returns rise to £14.8 over 50 years and £16.5 over 80 years per £1 invested.

Early-years BSL acquisition can have positive potential returns even when provided alongside hearing technologies.

  • When used alongside hearing technologies to mitigate the risk of early language deprivation for deaf children for which technology may not be fully beneficial, the economic returns depend on the proportion of children at risk of incomplete language acquisition. When 15–20% of children are assumed at risk, benefits begin to outweigh costs with higher returns as this group grows.

Recommendations

  • Ensure Early Access to BSL for Deaf Children. Provide all families, especially hearing parents, with clear and balanced information on both signed and spoken language options.
  • Embed early BSL exposure from infancy within standard early intervention programmes alongside hearing technologies and speech therapy.
  • Establish dedicated research funding to address evidence gaps on the long-term impacts of early BSL exposure across health, education, and employment.

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Hafner, Marco, Daniel Lee, Katie Sykes, and Erez Yerushalmi, The value of British Sign Language: An economic analysis. Santa Monica, CA: RAND Corporation, 2025. https://www.rand.org/pubs/research_reports/RRA4492-1.html.
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This research was funded by the British Deaf Association and conducted by RAND Europe.

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