diff --git a/src/compiler/codegen.jl b/src/compiler/codegen.jl
index fc461698..57e333b1 100644
--- a/src/compiler/codegen.jl
+++ b/src/compiler/codegen.jl
@@ -5,6 +5,7 @@ include("codegen/passes/rewrite.jl")            # @rewrite, rewrite_patterns! fr
 include("codegen/passes/alias_analysis.jl")    # alias_analysis_pass!
 include("codegen/passes/token_order.jl")       # token_order_pass!
 include("codegen/passes/dce.jl")              # dce_pass!
+include("codegen/passes/index_normalize.jl")  # index_lower_pass!
 include("codegen/passes/pipeline.jl")          # run_passes!
 include("codegen/kernel.jl")
 include("codegen/control_flow.jl")
diff --git a/src/compiler/codegen/passes/index_normalize.jl b/src/compiler/codegen/passes/index_normalize.jl
new file mode 100644
index 00000000..b0549508
--- /dev/null
+++ b/src/compiler/codegen/passes/index_normalize.jl
@@ -0,0 +1,76 @@
+# Index Lowering Pass
+#
+# Converts 1-based Julia indices to 0-based Tile IR indices for
+# load_partition_view and store_partition_view.
+#
+# Uses the RFunc (callable RHS) extension to the @rewrite framework:
+# for each index element in the indices tuple, inserts subi(elem, 1).
+
+using Core: SSAValue
+
+#=============================================================================
+ Implementation
+=============================================================================#
+
+function _lower_indices_rhs(sci, block, inst, match)
+    idx = match.bindings[:idx]
+    ref = SSAValue(inst)
+
+    # Get tuple type to determine element count and types
+    idx_type = CC.widenconst(value_type(block, idx))
+    idx_type <: Tuple || return false
+    n = fieldcount(idx_type)
+    n == 0 && return true
+
+    # Extract each element via getfield, subtract 1, build new tuple
+    lowered = Any[]
+    for i in 1:n
+        ft = fieldtype(idx_type, i)
+        elem = SSAValue(insert_before!(block, ref,
+            Expr(:call, GlobalRef(Core, :getfield), idx, i), ft))
+        sub = SSAValue(insert_before!(block, ref,
+            Expr(:call, GlobalRef(Intrinsics, :subi), elem, one(ft)), ft))
+        push!(lowered, sub)
+    end
+
+    new_tuple = SSAValue(insert_before!(block, ref,
+        Expr(:call, GlobalRef(Core, :tuple), lowered...), idx_type))
+
+    s = stmt(inst)
+    for i in eachindex(s.args)
+        s.args[i] === idx && (s.args[i] = new_tuple)
+    end
+
+    return true
+end
+
+#=============================================================================
+ Rewrite rules
+=============================================================================#
+
+# Lower 1-based indices → 0-based for load_partition_view.
+# args: (pv, latency, allow_tma, indices_tuple)
+const LOAD_INDEX_LOWER = RewriteRule(
+    PCall(:load_partition_view, [PBind(:pv), PBind(:lat), PBind(:tma), PBind(:idx)]),
+    RFunc(_lower_indices_rhs)
+)
+
+# Lower 1-based indices → 0-based for store_partition_view.
+# args: (pv, tile, latency, allow_tma, indices_tuple)
+const STORE_INDEX_LOWER = RewriteRule(
+    PCall(:store_partition_view, [PBind(:pv), PBind(:tile), PBind(:lat), PBind(:tma), PBind(:idx)]),
+    RFunc(_lower_indices_rhs)
+)
+
+const INDEX_LOWER_RULES = RewriteRule[LOAD_INDEX_LOWER, STORE_INDEX_LOWER]
+
+#=============================================================================
+ Driver
+=============================================================================#
+
+"""
+    index_lower_pass!(sci::StructuredIRCode)
+
+Lower 1-based Julia indices to 0-based Tile IR indices for load/store ops.
+"""
+index_lower_pass!(sci::StructuredIRCode) = rewrite_patterns!(sci, INDEX_LOWER_RULES)
diff --git a/src/compiler/codegen/passes/pipeline.jl b/src/compiler/codegen/passes/pipeline.jl
index 450706f0..7665056d 100644
--- a/src/compiler/codegen/passes/pipeline.jl
+++ b/src/compiler/codegen/passes/pipeline.jl
@@ -124,6 +124,7 @@ and subprogram compilation.
 function run_passes!(sci::StructuredIRCode)
     # Rewrite passes (order matters: normalize before optimize, SVE before FMA)
     normalize_pass!(sci)
+    index_lower_pass!(sci)
     scalar_view_elim_pass!(sci)
     fma_fusion_pass!(sci)
 
diff --git a/src/language/operations.jl b/src/language/operations.jl
index 1d8edce3..405f7032 100644
--- a/src/language/operations.jl
+++ b/src/language/operations.jl
@@ -134,7 +134,7 @@ tile = ct.load(arr, (bidx, bidy), (TM, TN); order=(2, 1))
     matched = _match_shape(Val(shape), Val(ndims(arr)))
     tv = Intrinsics.make_tensor_view(arr)
     pv = Intrinsics.make_partition_view(tv, matched, padding_mode, order)
-    tile = Intrinsics.load_partition_view(pv, latency, allow_tma, promote(index...) .- One())
+    tile = Intrinsics.load_partition_view(pv, latency, allow_tma, promote(index...))
     reshape(tile, shape)
 end
 
@@ -148,7 +148,7 @@ end
     tv = Intrinsics.make_tensor_view(arr)
     shape = ntuple(_ -> 1, Val(N))
     pv = Intrinsics.make_partition_view(tv, shape, PaddingMode.Undetermined, nothing)
-    tile = Intrinsics.load_partition_view(pv, nothing, nothing, promote(indices...) .- One())
+    tile = Intrinsics.load_partition_view(pv, nothing, nothing, promote(indices...))
     Intrinsics.to_scalar(reshape(tile, ()))
 end
 
@@ -203,7 +203,7 @@ Returns the stored tile (enables chaining and helps constant folding).
                        latency::Union{Int, Nothing}=nothing,
                        allow_tma::Union{Bool, Nothing}=nothing) where {T}
     reshaped = _reshape_to_rank(tile, Val(ndims(arr)))
-    _store_reshaped(arr, reshaped, order, latency, allow_tma, promote(index...) .- One())
+    _store_reshaped(arr, reshaped, order, latency, allow_tma, promote(index...))
     return tile  # XXX: enables constant folding; remove when possible (see "constant folding" test)
 end